[FFmpeg-cvslog] avformat/hevc: Check num_long_term_ref_pics_sps to avoid potentially long loops
Michael Niedermayer
git at videolan.org
Mon Aug 24 17:45:27 CEST 2015
ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Mon Aug 24 13:04:38 2015 +0200| [b06958917cca35a0dc7ac1da4d8e681cdea811ed] | committer: Michael Niedermayer
avformat/hevc: Check num_long_term_ref_pics_sps to avoid potentially long loops
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit ee155c18a2c50b339ba5f6f223fbb6dc343fd471)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b06958917cca35a0dc7ac1da4d8e681cdea811ed
---
libavformat/hevc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavformat/hevc.c b/libavformat/hevc.c
index 9932d92..f403e1c 100644
--- a/libavformat/hevc.c
+++ b/libavformat/hevc.c
@@ -566,6 +566,8 @@ static int hvcc_parse_sps(GetBitContext *gb,
if (get_bits1(gb)) { // long_term_ref_pics_present_flag
unsigned num_long_term_ref_pics_sps = get_ue_golomb_long(gb);
+ if (num_long_term_ref_pics_sps > 31U)
+ return AVERROR_INVALIDDATA;
for (i = 0; i < num_long_term_ref_pics_sps; i++) { // num_long_term_ref_pics_sps
int len = FFMIN(log2_max_pic_order_cnt_lsb_minus4 + 4, 16);
skip_bits (gb, len); // lt_ref_pic_poc_lsb_sps[i]
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