[FFmpeg-cvslog] avformat/aviobuf: Check that avio_seek() target is non negative

[Michael Niedermayer]

ffmpeg | branch: release/2.1 | Michael Niedermayer <michaelni at gmx.at> | Sun Dec 14 17:26:11 2014 +0100| [844f7f78aa523fb452c0271cb7dc6742039b9d3c] | committer: Michael Niedermayer

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

Fixes out of array access

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

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=844f7f78aa523fb452c0271cb7dc6742039b9d3c
---

 libavformat/aviobuf.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 8218078..87ad388 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -217,6 +217,9 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
             return offset1;
         offset += offset1;
     }
+    if (offset < 0)
+        return AVERROR(EINVAL);
+
     offset1 = offset - pos;
     if (!s->must_flush && (!s->direct || !s->seek) &&
         offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {