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avformat/aviobuf: Check that avio_seek() target is non negative

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Fixes out of array access

Suggested-by: Andrew Scherkus <scherkus@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit ed86dbd05d61363dc1c0d33f3267e2177c985fdd)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-14 17:26:11 +01:00
parent 3b332ef33c
commit 0d277be45a
1 changed files with 3 additions and 0 deletions
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3
libavformat/aviobuf.c
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@ -221,6 +221,9 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
return offset1; return offset1;
offset += offset1; offset += offset1;
} }
if (offset < 0)
return AVERROR(EINVAL);
offset1 = offset - pos; offset1 = offset - pos;
if (!s->must_flush && (!s->direct || !s->seek) && if (!s->must_flush && (!s->direct || !s->seek) &&
offset1 >= 0 && offset1 <= buffer_size) { offset1 >= 0 && offset1 <= buffer_size) {