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linux-stable/drivers/media
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Baisong Zhong 6b60cf73a9 media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer() 
[ Upstream commit 0ed554fd76 ]

Wei Chen reports a kernel bug as blew:

general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
...
Call Trace:
<TASK>
__i2c_transfer+0x77e/0x1930 drivers/i2c/i2c-core-base.c:2109
i2c_transfer+0x1d5/0x3d0 drivers/i2c/i2c-core-base.c:2170
i2cdev_ioctl_rdwr+0x393/0x660 drivers/i2c/i2c-dev.c:297
i2cdev_ioctl+0x75d/0x9f0 drivers/i2c/i2c-dev.c:458
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd834a8bded

In az6027_i2c_xfer(), if msg[i].addr is 0x99,
a null-ptr-deref will caused when accessing msg[i].buf.
For msg[i].len is 0 and msg[i].buf is null.

Fix this by checking msg[i].len in az6027_i2c_xfer().

Link: https://lore.kernel.org/lkml/CAO4mrfcPHB5aQJO=mpqV+p8mPLNg-Fok0gw8gZ=zemAfMGTzMg@mail.gmail.com/

Link: https://lore.kernel.org/linux-media/20221120065918.2160782-1-zhongbaisong@huawei.com
Fixes: 76f9a820c8 ("V4L/DVB: AZ6027: Initial import of the driver")
Reported-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-12-31 13:32:16 +01:00
..
cec media fixes for v6.1-rc2 2022-10-22 15:30:15 -07:00
common media: videobuf2-core: take mmap_lock in vb2_get_unmapped_area() 2022-12-07 11:25:40 -08:00
dvb-core media: dvb-core: Fix ignored return value in dvb_register_frontend() 2022-12-31 13:32:16 +01:00
dvb-frontends media fixes for v6.1-rc2 2022-10-22 15:30:15 -07:00
firewire media: Makefiles: remove extra spaces 2022-03-12 16:59:52 +01:00
i2c media: mt9p031: Drop bogus v4l2_subdev_get_try_crop() call from mt9p031_init_cfg() 2022-12-31 13:32:16 +01:00
mc media: mc: convert pipeline funcs to take media_pad 2022-09-24 09:22:30 +02:00
mmc media: media/*/Kconfig: sort entries 2022-03-18 05:58:35 +01:00
pci media: solo6x10: fix possible memory leak in solo_sysfs_init() 2022-12-31 13:32:13 +01:00
platform media: amphion: Fix error handling in vpu_driver_init() 2022-12-31 13:32:13 +01:00
radio media fixes for v6.1-rc2 2022-10-22 15:30:15 -07:00
rc media: imon: fix a race condition in send_packet() 2022-12-31 13:32:16 +01:00
spi media updates for v5.18-rc1 2022-03-23 14:51:35 -07:00
test-drivers media: vimc: Fix wrong function called when vimc_init() fails 2022-12-31 13:32:16 +01:00
tuners media fixes for v6.1-rc2 2022-10-22 15:30:15 -07:00
usb media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer() 2022-12-31 13:32:16 +01:00
v4l2-core media: videobuf-dma-contig: use dma_mmap_coherent 2022-12-31 13:32:13 +01:00
Kconfig media: remove reference to CONFIG_EMBEDDED in MEDIA_SUPPORT_FILTER 2022-09-08 18:19:29 +02:00
Makefile media: Makefiles: remove extra spaces 2022-03-12 16:59:52 +01:00