hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

media: af9035: prevent buffer overflow on write 

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>
This commit is contained in:
Jozef Balga 2018-08-21 05:01:04 -04:00 committed by Mauro Carvalho Chehab
parent 4fbf51ee6e
commit 312f73b648
1 changed files with 4 additions and 2 deletions
drivers/media/usb/dvb-usb-v2
af9035.c

6
drivers/media/usb/dvb-usb-v2/af9035.c
View File

@ -402,8 +402,10 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
if (msg[0].addr == state->af9033_i2c_addr[1]) if (msg[0].addr == state->af9033_i2c_addr[1])
reg |= 0x100000; reg |= 0x100000;
ret = af9035_wr_regs(d, reg, &msg[0].buf[3], ret = (msg[0].len >= 3) ? af9035_wr_regs(d, reg,
msg[0].len - 3); &msg[0].buf[3],
msg[0].len - 3)
: -EOPNOTSUPP;
} else { } else {
/* I2C write */ /* I2C write */
u8 buf[MAX_XFER_SIZE]; u8 buf[MAX_XFER_SIZE];