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| author | Alex Guo <alexguo1023@gmail.com> | 2025-06-15 21:32:31 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-20 18:41:27 +0200 |
| commit | 19eb5d8e6aa1169d368a4d69aae5572950deb89d (patch) | |
| tree | 664b0c7b95eecc4c0861ca6a96d8df9d9765ea4c | |
| parent | 69c68d745f719f69aa2556dcaef23c1715596b0c (diff) | |
media: dvb-frontends: dib7090p: fix null-ptr-deref in dib7090p_rw_on_apb()
[ Upstream commit ce5cac69b2edac3e3246fee03e8f4c2a1075238b ]
In dib7090p_rw_on_apb, msg is controlled by user. When msg[0].buf is null and
msg[0].len is zero, former checks on msg[0].buf would be passed. If accessing
msg[0].buf[2] without sanity check, null pointer deref would happen. We add
check on msg[0].len to prevent crash. Similar issue occurs when access
msg[1].buf[0] and msg[1].buf[1].
Similar commit: commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")
Signed-off-by: Alex Guo <alexguo1023@gmail.com>
Link: https://lore.kernel.org/r/20250616013231.730221-1-alexguo1023@gmail.com
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/media/dvb-frontends/dib7000p.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/dib7000p.c b/drivers/media/dvb-frontends/dib7000p.c index b40daf242046..360a2d7dd3ed 100644 --- a/drivers/media/dvb-frontends/dib7000p.c +++ b/drivers/media/dvb-frontends/dib7000p.c @@ -2256,8 +2256,12 @@ static int dib7090p_rw_on_apb(struct i2c_adapter *i2c_adap, u16 word; if (num == 1) { /* write */ + if (msg[0].len < 3) + return -EOPNOTSUPP; dib7000p_write_word(state, apb_address, ((msg[0].buf[1] << 8) | (msg[0].buf[2]))); } else { + if (msg[1].len < 2) + return -EOPNOTSUPP; word = dib7000p_read_word(state, apb_address); msg[1].buf[0] = (word >> 8) & 0xff; msg[1].buf[1] = (word) & 0xff; |