Zhipeng LuandSasha Levin 437a111f79 media: edia: dvbdev: fix a use-after-free ...

[ Upstream commit 8c64f4cdf4 ]

In dvb_register_device, *pdvbdev is set equal to dvbdev, which is freed
in several error-handling paths. However, *pdvbdev is not set to NULL
after dvbdev's deallocation, causing use-after-frees in many places,
for example, in the following call chain:

budget_register
  |-> dvb_dmxdev_init
        |-> dvb_register_device
  |-> dvb_dmxdev_release
        |-> dvb_unregister_device
              |-> dvb_remove_device
                    |-> dvb_device_put
                          |-> kref_put

When calling dvb_unregister_device, dmxdev->dvbdev (i.e. *pdvbdev in
dvb_register_device) could point to memory that had been freed in
dvb_register_device. Thereafter, this pointer is transferred to
kref_put and triggering a use-after-free.

Link: https://lore.kernel.org/linux-media/20240203134046.3120099-1-alexious@zju.edu.cn
Fixes: b619010247 ("V4L/DVB (5244): Dvbdev: fix illegal re-usage of fileoperations struct")
Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-03-26 18:20:46 -04:00

..

dmxdev.c

…

dvb_ca_en50221.c

media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221

2023-06-09 10:34:13 +02:00

dvb_demux.c

…

dvb_frontend.c

media: dvb-core: Fix kernel WARNING for blocking operation in wait_event*()

2023-06-09 10:34:12 +02:00

dvb_math.c

…

dvb_net.c

media: dvb-core: Fix use-after-free due on race condition at dvb_net

2023-06-09 10:34:12 +02:00

dvb_ringbuffer.c

…

dvb_vb2.c

…

dvbdev.c

media: edia: dvbdev: fix a use-after-free

2024-03-26 18:20:46 -04:00

Kconfig

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Makefile

…