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Tomi Valkeinen 0d96687213 media: videobuf2-dma-contig: fix bad kfree in vb2_dma_contig_clear_max_seg_size Commit `9495b7e92f` ("driver core: platform: Initialize dma_parms for platform devices") in v5.7-rc5 causes vb2_dma_contig_clear_max_seg_size() to kfree memory that was not allocated by vb2_dma_contig_set_max_seg_size(). The assumption in vb2_dma_contig_set_max_seg_size() seems to be that dev->dma_parms is always NULL when the driver is probed, and the case where dev->dma_parms has bee initialized by someone else than the driver (by calling vb2_dma_contig_set_max_seg_size) will cause a failure. All the current users of these functions are platform devices, which now always have dma_parms set by the driver core. To fix the issue for v5.7, make vb2_dma_contig_set_max_seg_size() return an error if dma_parms is NULL to be on the safe side, and remove the kfree code from vb2_dma_contig_clear_max_seg_size(). For v5.8 we should remove the two functions and move the dma_set_max_seg_size() calls into the drivers. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Fixes: `9495b7e92f` ("driver core: platform: Initialize dma_parms for platform devices") Cc: stable@vger.kernel.org Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>		2020-06-11 19:20:55 +02:00
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Documentation	media: v4l2-subdev.rst: correct information about v4l2 events	2020-06-11 19:20:26 +02:00
drivers	media: videobuf2-dma-contig: fix bad kfree in vb2_dma_contig_clear_max_seg_size	2020-06-11 19:20:55 +02:00
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include	media: videobuf2-dma-contig: fix bad kfree in vb2_dma_contig_clear_max_seg_size	2020-06-11 19:20:55 +02:00
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MAINTAINERS	media: i2c: Add ov2740 image sensor driver	2020-05-25 15:43:14 +02:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.