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avformat/aviobuf: Keep checksum_ptr consistent in avio_seek()

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Otherwise it might be > buf_ptr in which case ffio_get_checksum()
could segfault (s->buf_ptr - s->checksum_ptr would be negative
which would be converted to something very big when converted
to unsigned for the update_checksum callback).

Fixes ticket #11233.

Reported-by: Du4t
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
(cherry picked from commit 987c955cd7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Andreas Rheinhardt
2025-07-11 22:58:26 +02:00
committed by Michael Niedermayer
parent 5418fbb7f4
commit 26115ca03d
1 changed files with 1 additions and 1 deletions
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2
libavformat/aviobuf.c
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@@ -308,7 +308,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
ctx->seek_count++;
if (!s->write_flag)
s->buf_end = s->buffer;
s->buf_ptr = s->buf_ptr_max = s->buffer;
s->checksum_ptr = s->buf_ptr = s->buf_ptr_max = s->buffer;
s->pos = offset;
}
s->eof_reached = 0;