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| author | Zhang Shurong <zhang_shurong@foxmail.com> | 2023-07-09 00:28:17 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 11:01:07 +0200 |
| commit | a9def3e9718a4dc756f48db147d42ec41a966240 (patch) | |
| tree | 673313d74bd62747f4dea22a5100fb1926ffcd3f | |
| parent | 4a9763d2bc4a6d6fab42555b9c0b2eefa32585ac (diff) | |
| download | linux-a9def3e9718a4dc756f48db147d42ec41a966240.tar.gz linux-a9def3e9718a4dc756f48db147d42ec41a966240.tar.bz2 linux-a9def3e9718a4dc756f48db147d42ec41a966240.zip | |
media: az6007: Fix null-ptr-deref in az6007_i2c_xfer()
[ Upstream commit 1047f9343011f2cedc73c64829686206a7e9fc3f ]
In az6007_i2c_xfer, msg is controlled by user. When msg[i].buf
is null and msg[i].len is zero, former checks on msg[i].buf would be
passed. Malicious data finally reach az6007_i2c_xfer. If accessing
msg[i].buf[0] without sanity check, null ptr deref would happen.
We add check on msg[i].len to prevent crash.
Similar commit:
commit 0ed554fd769a
("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")
Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/az6007.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/az6007.c b/drivers/media/usb/dvb-usb-v2/az6007.c index 7524c90f5da6..6cbfe75791c2 100644 --- a/drivers/media/usb/dvb-usb-v2/az6007.c +++ b/drivers/media/usb/dvb-usb-v2/az6007.c @@ -788,6 +788,10 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], if (az6007_xfer_debug) printk(KERN_DEBUG "az6007: I2C W addr=0x%x len=%d\n", addr, msgs[i].len); + if (msgs[i].len < 1) { + ret = -EIO; + goto err; + } req = AZ6007_I2C_WR; index = msgs[i].buf[0]; value = addr | (1 << 8); @@ -802,6 +806,10 @@ static int az6007_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], if (az6007_xfer_debug) printk(KERN_DEBUG "az6007: I2C R addr=0x%x len=%d\n", addr, msgs[i].len); + if (msgs[i].len < 1) { + ret = -EIO; + goto err; + } req = AZ6007_I2C_RD; index = msgs[i].buf[0]; value = addr; |