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avformat/mov: fix potential unsigned underflow in loop condition

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if sc->tts_count is 0, this condition will wrap around to UINT_MAX and the
code will try to dereference a NULL pointer.

Fixes ticket #11417

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2025-01-13 18:17:06 -03:00
parent 8eb1d76e14
commit fd1772b747
1 changed files with 1 additions and 1 deletions
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libavformat/mov.c
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@ -5191,7 +5191,7 @@ static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
}
#if FF_API_R_FRAME_RATE
for (int i = 1; sc->stts_count && i < sc->tts_count - 1; i++) {
for (unsigned int i = 1; sc->stts_count && i + 1 < sc->tts_count; i++) {
if (sc->tts_data[i].duration == sc->tts_data[0].duration)
continue;
stts_constant = 0;