forked from luck/tmp_suning_uos_patched
f7b83b908f
Do not leak memory by updating pointer with potentially NULL realloc return value. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Reviewed-by: Carsten Emde <C.Emde@osadl.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
253 lines
7.8 KiB
C
253 lines
7.8 KiB
C
/*
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drm_edid_load.c: use a built-in EDID data set or load it via the firmware
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interface
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Copyright (C) 2012 Carsten Emde <C.Emde@osadl.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include "drmP.h"
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#include "drm_crtc.h"
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#include "drm_crtc_helper.h"
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#include "drm_edid.h"
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static char edid_firmware[PATH_MAX];
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module_param_string(edid_firmware, edid_firmware, sizeof(edid_firmware), 0644);
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MODULE_PARM_DESC(edid_firmware, "Do not probe monitor, use specified EDID blob "
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"from built-in data or /lib/firmware instead. ");
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#define GENERIC_EDIDS 4
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static char *generic_edid_name[GENERIC_EDIDS] = {
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"edid/1024x768.bin",
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"edid/1280x1024.bin",
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"edid/1680x1050.bin",
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"edid/1920x1080.bin",
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};
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static u8 generic_edid[GENERIC_EDIDS][128] = {
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x23, 0x1a, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x08, 0x00, 0x61, 0x40,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x64, 0x19,
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0x00, 0x40, 0x41, 0x00, 0x26, 0x30, 0x08, 0x90,
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0x36, 0x00, 0x63, 0x0a, 0x11, 0x00, 0x00, 0x18,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x2f, 0x31, 0x07, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x58,
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0x47, 0x41, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x55,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x2c, 0x23, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0x81, 0x80,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x30, 0x2a,
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0x00, 0x98, 0x51, 0x00, 0x2a, 0x40, 0x30, 0x70,
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0x13, 0x00, 0xbc, 0x63, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x3e, 0x40, 0x0b, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x53,
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0x58, 0x47, 0x41, 0x0a, 0x20, 0x20, 0x00, 0xa0,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x2b, 0x1b, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xb3, 0x00,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x21, 0x39,
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0x90, 0x30, 0x62, 0x1a, 0x27, 0x40, 0x68, 0xb0,
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0x36, 0x00, 0xb5, 0x11, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x40, 0x42, 0x0f, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x57,
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0x53, 0x58, 0x47, 0x41, 0x0a, 0x20, 0x00, 0x26,
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},
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{
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0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
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0x31, 0xd8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x05, 0x16, 0x01, 0x03, 0x6d, 0x32, 0x1c, 0x78,
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0xea, 0x5e, 0xc0, 0xa4, 0x59, 0x4a, 0x98, 0x25,
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0x20, 0x50, 0x54, 0x00, 0x00, 0x00, 0xd1, 0xc0,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3a,
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0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
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0x45, 0x00, 0xf4, 0x19, 0x11, 0x00, 0x00, 0x1e,
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0x00, 0x00, 0x00, 0xff, 0x00, 0x4c, 0x69, 0x6e,
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0x75, 0x78, 0x20, 0x23, 0x30, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x3b,
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0x3d, 0x42, 0x44, 0x0f, 0x00, 0x0a, 0x20, 0x20,
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0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfc,
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0x00, 0x4c, 0x69, 0x6e, 0x75, 0x78, 0x20, 0x46,
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0x48, 0x44, 0x0a, 0x20, 0x20, 0x20, 0x00, 0x05,
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},
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};
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static int edid_load(struct drm_connector *connector, char *name,
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char *connector_name)
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{
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const struct firmware *fw;
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struct platform_device *pdev;
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u8 *fwdata = NULL, *edid, *new_edid;
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int fwsize, expected;
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int builtin = 0, err = 0;
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int i, valid_extensions = 0;
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pdev = platform_device_register_simple(connector_name, -1, NULL, 0);
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if (IS_ERR(pdev)) {
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DRM_ERROR("Failed to register EDID firmware platform device "
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"for connector \"%s\"\n", connector_name);
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err = -EINVAL;
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goto out;
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}
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err = request_firmware(&fw, name, &pdev->dev);
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platform_device_unregister(pdev);
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if (err) {
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i = 0;
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while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i]))
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i++;
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if (i < GENERIC_EDIDS) {
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err = 0;
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builtin = 1;
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fwdata = generic_edid[i];
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fwsize = sizeof(generic_edid[i]);
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}
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}
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if (err) {
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DRM_ERROR("Requesting EDID firmware \"%s\" failed (err=%d)\n",
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name, err);
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goto out;
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}
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if (fwdata == NULL) {
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fwdata = (u8 *) fw->data;
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fwsize = fw->size;
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}
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expected = (fwdata[0x7e] + 1) * EDID_LENGTH;
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if (expected != fwsize) {
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DRM_ERROR("Size of EDID firmware \"%s\" is invalid "
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"(expected %d, got %d)\n", name, expected, (int) fwsize);
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err = -EINVAL;
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goto relfw_out;
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}
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edid = kmalloc(fwsize, GFP_KERNEL);
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if (edid == NULL) {
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err = -ENOMEM;
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goto relfw_out;
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}
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memcpy(edid, fwdata, fwsize);
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if (!drm_edid_block_valid(edid, 0)) {
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DRM_ERROR("Base block of EDID firmware \"%s\" is invalid ",
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name);
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kfree(edid);
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err = -EINVAL;
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goto relfw_out;
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}
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for (i = 1; i <= edid[0x7e]; i++) {
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if (i != valid_extensions + 1)
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memcpy(edid + (valid_extensions + 1) * EDID_LENGTH,
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edid + i * EDID_LENGTH, EDID_LENGTH);
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if (drm_edid_block_valid(edid + i * EDID_LENGTH, i))
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valid_extensions++;
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}
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if (valid_extensions != edid[0x7e]) {
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edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
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DRM_INFO("Found %d valid extensions instead of %d in EDID data "
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"\"%s\" for connector \"%s\"\n", valid_extensions,
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edid[0x7e], name, connector_name);
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edid[0x7e] = valid_extensions;
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new_edid = krealloc(edid, (valid_extensions + 1) * EDID_LENGTH,
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GFP_KERNEL);
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if (new_edid == NULL) {
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err = -ENOMEM;
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kfree(edid);
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goto relfw_out;
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}
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edid = new_edid;
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}
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connector->display_info.raw_edid = edid;
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DRM_INFO("Got %s EDID base block and %d extension%s from "
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"\"%s\" for connector \"%s\"\n", builtin ? "built-in" :
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"external", valid_extensions, valid_extensions == 1 ? "" : "s",
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name, connector_name);
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relfw_out:
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release_firmware(fw);
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out:
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return err;
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}
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int drm_load_edid_firmware(struct drm_connector *connector)
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{
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char *connector_name = drm_get_connector_name(connector);
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char *edidname = edid_firmware, *last, *colon;
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int ret;
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if (*edidname == '\0')
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return 0;
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colon = strchr(edidname, ':');
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if (colon != NULL) {
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if (strncmp(connector_name, edidname, colon - edidname))
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return 0;
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edidname = colon + 1;
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if (*edidname == '\0')
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return 0;
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}
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last = edidname + strlen(edidname) - 1;
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if (*last == '\n')
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*last = '\0';
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ret = edid_load(connector, edidname, connector_name);
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if (ret)
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return 0;
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drm_mode_connector_update_edid_property(connector,
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(struct edid *) connector->display_info.raw_edid);
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return drm_add_edid_modes(connector, (struct edid *)
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connector->display_info.raw_edid);
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}
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