[FFmpeg-cvslog] avcodec/hevc_ps: fix integer overflow in log2_parallel_merge_level_minus2
Michael Niedermayer
git at videolan.org
Tue Aug 1 15:45:10 EEST 2017
ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul 24 15:48:37 2017 +0200| [7f3124e08c3084c27ffa1dbd71659844a2c23f32] | committer: Michael Niedermayer
avcodec/hevc_ps: fix integer overflow in log2_parallel_merge_level_minus2
Fixes: runtime error: signed integer overflow: -2147483647 - 2 cannot be represented in type 'int'
Fixes: 2702/clusterfuzz-testcase-minimized-4511932591636480
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 74c1c22d7f0d25f527ed2ebf62493be5ad52c972)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7f3124e08c3084c27ffa1dbd71659844a2c23f32
---
libavcodec/hevc_ps.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index 7a4ca7083a..87e807bdd3 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -1413,6 +1413,7 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
HEVCSPS *sps = NULL;
int i, ret = 0;
unsigned int pps_id = 0;
+ unsigned log2_parallel_merge_level_minus2;
AVBufferRef *pps_buf;
HEVCPPS *pps = av_mallocz(sizeof(*pps));
@@ -1599,13 +1600,14 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
goto err;
}
pps->lists_modification_present_flag = get_bits1(gb);
- pps->log2_parallel_merge_level = get_ue_golomb_long(gb) + 2;
- if (pps->log2_parallel_merge_level > sps->log2_ctb_size) {
+ log2_parallel_merge_level_minus2 = get_ue_golomb_long(gb);
+ if (log2_parallel_merge_level_minus2 > sps->log2_ctb_size) {
av_log(avctx, AV_LOG_ERROR, "log2_parallel_merge_level_minus2 out of range: %d\n",
- pps->log2_parallel_merge_level - 2);
+ log2_parallel_merge_level_minus2);
ret = AVERROR_INVALIDDATA;
goto err;
}
+ pps->log2_parallel_merge_level = log2_parallel_merge_level_minus2 + 2;
pps->slice_header_extension_present_flag = get_bits1(gb);
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