diff options
| author | Jozef Balga <jozef.balga@gmail.com> | 2018-08-21 05:01:04 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-20 09:52:37 +0200 |
| commit | 2a585d445050f16030b372ada1f4ce076de27833 (patch) | |
| tree | 3e87f78cc5da2be3d1d583346fb9c061e894a7ea /drivers/media | |
| parent | 4e7ef8fc8001589339083872f3b6260734cc0e76 (diff) | |
media: af9035: prevent buffer overflow on write
[ Upstream commit 312f73b648626a0526a3aceebb0a3192aaba05ce ]
When less than 3 bytes are written to the device, memcpy is called with
negative array size which leads to buffer overflow and kernel panic. This
patch adds a condition and returns -EOPNOTSUPP instead.
Fixes bugzilla issue 64871
[mchehab+samsung@kernel.org: fix a merge conflict and changed the
condition to match the patch's comment, e. g. len == 3 could
also be valid]
Signed-off-by: Jozef Balga <jozef.balga@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/af9035.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c index 6e02a15d39ce..abddb621d9e6 100644 --- a/drivers/media/usb/dvb-usb-v2/af9035.c +++ b/drivers/media/usb/dvb-usb-v2/af9035.c @@ -389,8 +389,10 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap, msg[0].addr == (state->af9033_i2c_addr[1] >> 1)) reg |= 0x100000; - ret = af9035_wr_regs(d, reg, &msg[0].buf[3], - msg[0].len - 3); + ret = (msg[0].len >= 3) ? af9035_wr_regs(d, reg, + &msg[0].buf[3], + msg[0].len - 3) + : -EOPNOTSUPP; } else { /* I2C write */ u8 buf[MAX_XFER_SIZE]; |