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avformat/rtpenc_h264_hevc: Check space for nal_length_size in ff_rtp_send_h264_hevc()

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Fixes: memcpy with negative size
Fixes: momo_trip-poc/input

Reported-by: Momoko Shiraishi <shiraishi@os.is.s.u-tokyo.ac.jp>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-10-24 20:29:23 +02:00
parent afd927e0ca
commit d03483bd26
1 changed files with 3 additions and 0 deletions
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3
libavformat/rtpenc_h264_hevc.c
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@@ -196,6 +196,9 @@ void ff_rtp_send_h264_hevc(AVFormatContext *s1, const uint8_t *buf1, int size)
r1 = ff_nal_mp4_find_startcode(r, end, s->nal_length_size);
if (!r1)
r1 = end;
// Check that the last is not truncated
if (r1 - r < s->nal_length_size)
break;
r += s->nal_length_size;
} else {
while (!*(r++));