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net: nfc: fix bounds checking bugs on "pipe"

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This is similar to commit 674d9de02a ("NFC: Fix possible memory
corruption when handling SHDLC I-Frame commands") and commit d7ee81ad09
("NFC: nci: Add some bounds checking in nci_hci_cmd_received()") which
added range checks on "pipe".

The "pipe" variable comes skb->data[0] in nfc_hci_msg_rx_work().
It's in the 0-255 range.  We're using it as the array index into the
hdev->pipes[] array which has NFC_HCI_MAX_PIPES (128) members.

Fixes: 118278f20a ("NFC: hci: Add pipes table to reference them with a tuple {gate, host}")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2020-03-04 17:24:31 +03:00 committed by David S. Miller
parent e25d5dbcff
commit a3aefbfe45
1 changed files with 16 additions and 3 deletions
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19
net/nfc/hci/core.c
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@ -181,13 +181,20 @@ void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
struct sk_buff *skb)
{
u8 gate = hdev->pipes[pipe].gate;
u8 status = NFC_HCI_ANY_OK;
struct hci_create_pipe_resp *create_info;
struct hci_delete_pipe_noti *delete_info;
struct hci_all_pipe_cleared_noti *cleared_info;
u8 gate;
pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
pr_debug("from pipe %x cmd %x\n", pipe, cmd);
if (pipe >= NFC_HCI_MAX_PIPES) {
status = NFC_HCI_ANY_E_NOK;
goto exit;
}
gate = hdev->pipes[pipe].gate;
switch (cmd) {
case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
@ -375,8 +382,14 @@ void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
struct sk_buff *skb)
{
int r = 0;
u8 gate = hdev->pipes[pipe].gate;
u8 gate;
if (pipe >= NFC_HCI_MAX_PIPES) {
pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
goto exit;
}
gate = hdev->pipes[pipe].gate;
if (gate == NFC_HCI_INVALID_GATE) {
pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
goto exit;