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avformat/ac4dec: Check remaining space in ac4_probe()

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Fixes: CID1538298 Untrusted loop bound
Fixes: undefined behavior

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2f04cb673cb394b6e1cda160af8faa733b62bae2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-05-23 01:43:42 +02:00
parent 4175b43533
commit 78ad74a20a
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1 changed files with 2 additions and 0 deletions
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libavformat/ac4dec.c
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@ -43,6 +43,8 @@ static int ac4_probe(const AVProbeData *p)
size += 4;
if (buf[1] == 0x41)
size += 2;
if (left < size)
break;
max_frames++;
left -= size;
buf += size;