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media: dvb-frontends: dib7090p: fix null-ptr-deref in dib7090p_rw_on_apb()

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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 0ed554fd76 ("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>
This commit is contained in:
Alex Guo
2025-06-15 21:32:31 -04:00
committed by Mauro Carvalho Chehab
parent ed0234c845
commit ce5cac69b2
1 changed files with 4 additions and 0 deletions
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4
drivers/media/dvb-frontends/dib7000p.c
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@@ -2260,8 +2260,12 @@ 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;