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media: av7110: prevent underflow in write_ts_to_decoder()

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The buf[4] value comes from the user via ts_play().  It is a value in
the u8 range.  The final length we pass to av7110_ipack_instant_repack()
is "len - (buf[4] + 1) - 4" so add a check to ensure that the length is
not negative.  It's not clear that passing a negative len value does
anything bad necessarily, but it's not best practice.

With the new bounds checking the "if (!len)" condition is no longer
possible or required so remove that.

Fixes: fd46d16d60 ("V4L/DVB (11759): dvb-ttpci: Add TS replay capability")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Dan Carpenter 2023-03-07 11:00:23 +01:00 committed by Mauro Carvalho Chehab
parent 4ae47770d5
commit eed9496a05
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/media/av7110/av7110_av.c
View file

@ -823,10 +823,10 @@ static int write_ts_to_decoder(struct av7110 *av7110, int type, const u8 *buf, s
av7110_ipack_flush(ipack);
if (buf[3] & ADAPT_FIELD) {
if (buf[4] > len - 1 - 4)
return 0;
len -= buf[4] + 1;
buf += buf[4] + 1;
if (!len)
return 0;
}
av7110_ipack_instant_repack(buf + 4, len - 4, ipack);