[FFmpeg-cvslog] avcodec/qpeg: Limit copy in qpeg_decode_intra() to the available bytes
Michael Niedermayer
git at videolan.org
Sun Mar 3 14:19:19 EET 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Feb 24 00:44:40 2019 +0100| [b819472995f55e827d6bb70dcdd86d963f65ae31] | committer: Michael Niedermayer
avcodec/qpeg: Limit copy in qpeg_decode_intra() to the available bytes
Fixes: Timeout (27 sec -> 39 milli sec)
Fixes: 13151/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QPEG_fuzzer-5717536023248896
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b819472995f55e827d6bb70dcdd86d963f65ae31
---
libavcodec/qpeg.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavcodec/qpeg.c b/libavcodec/qpeg.c
index 654fd998d6..d4195c5f0b 100644
--- a/libavcodec/qpeg.c
+++ b/libavcodec/qpeg.c
@@ -99,6 +99,8 @@ static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
}
}
} else {
+ if (bytestream2_get_bytes_left(&qctx->buffer) < copy)
+ copy = bytestream2_get_bytes_left(&qctx->buffer);
for(i = 0; i < copy; i++) {
dst[filled++] = bytestream2_get_byte(&qctx->buffer);
if (filled >= width) {
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