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| author | Zhang Shurong <zhang_shurong@foxmail.com> | 2023-07-09 00:02:20 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 10:48:16 +0200 |
| commit | e04affec2506ff5c12a18d78d7e694b3556a8982 (patch) | |
| tree | 4a5520c63ffbb85befdeaa0f35ba7b726be87d08 /drivers/media/usb | |
| parent | 63d962ac7a52c0ff4cd09af2e284dce5e5955dfe (diff) | |
| download | linux-stable-e04affec2506ff5c12a18d78d7e694b3556a8982.tar.gz linux-stable-e04affec2506ff5c12a18d78d7e694b3556a8982.tar.bz2 linux-stable-e04affec2506ff5c12a18d78d7e694b3556a8982.zip | |
media: anysee: fix null-ptr-deref in anysee_master_xfer
[ Upstream commit c30411266fd67ea3c02a05c157231654d5a3bdc9 ]
In anysee_master_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 anysee_master_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>
[hverkuil: add spaces around +]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/anysee.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/anysee.c b/drivers/media/usb/dvb-usb-v2/anysee.c index 20ee7eea2a91..83af86505363 100644 --- a/drivers/media/usb/dvb-usb-v2/anysee.c +++ b/drivers/media/usb/dvb-usb-v2/anysee.c @@ -211,7 +211,7 @@ static int anysee_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, while (i < num) { if (num > i + 1 && (msg[i+1].flags & I2C_M_RD)) { - if (msg[i].len > 2 || msg[i+1].len > 60) { + if (msg[i].len != 2 || msg[i + 1].len > 60) { ret = -EOPNOTSUPP; break; } |