From 74c1c22d7f0d25f527ed2ebf62493be5ad52c972 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 24 Jul 2017 15:48:37 +0200 Subject: 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 --- libavcodec/hevc_ps.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'libavcodec/hevc_ps.c') diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c index 7358b318b0..21dbaf85a5 100644 --- a/libavcodec/hevc_ps.c +++ b/libavcodec/hevc_ps.c @@ -1432,6 +1432,7 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx, int i, ret = 0; unsigned int pps_id = 0; ptrdiff_t nal_size; + unsigned log2_parallel_merge_level_minus2; AVBufferRef *pps_buf; HEVCPPS *pps = av_mallocz(sizeof(*pps)); @@ -1629,13 +1630,14 @@ 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); -- cgit v1.2.1