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| author | Baisong Zhong <zhongbaisong@huawei.com> | 2022-11-20 09:59:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 11:26:14 +0300 |
| commit | c712d1ccbfb787620422b437a5b8fac0802547bd (patch) | |
| tree | 1d8d4316c0275de446c0b250cd60c8d18859e7d2 | |
| parent | a9c452c70b482f8b3605c2d44ad831f561608f4d (diff) | |
| download | linux-c712d1ccbfb787620422b437a5b8fac0802547bd.tar.xz | |
media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()
[ Upstream commit 0ed554fd769a19ea8464bb83e9ac201002ef74ad ]
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: 76f9a820c867 ("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>
| -rw-r--r-- | drivers/media/usb/dvb-usb/az6027.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb/az6027.c b/drivers/media/usb/dvb-usb/az6027.c index 382c8075ef52..f2b5ba1d2809 100644 --- a/drivers/media/usb/dvb-usb/az6027.c +++ b/drivers/media/usb/dvb-usb/az6027.c @@ -978,6 +978,10 @@ static int az6027_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int n if (msg[i].addr == 0x99) { req = 0xBE; index = 0; + if (msg[i].len < 1) { + i = -EOPNOTSUPP; + break; + } value = msg[i].buf[0] & 0x00ff; length = 1; az6027_usb_out_op(d, req, value, index, data, length); |