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[FFmpeg-devel,2/5] avcodec/hevcdec: Check slice_cb_qp_offset / slice_cr_qp_offset

Message ID 20200919193109.31148-2-michael@niedermayer.cc
State Accepted
Commit 106f11f68af643ad1f372b840d38a0a30c6e9bcf
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Series [FFmpeg-devel,1/5] avcodec/sonic: Check for overread
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Commit Message

Michael Niedermayer Sept. 19, 2020, 7:31 p.m. UTC
Fixes: signed integer overflow: 29 + 2147483640 cannot be represented in type 'int'
Fixes: 25413/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5697909331591168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/hevcdec.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index c1de75abe1..7447dce590 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -801,6 +801,11 @@  static int hls_slice_header(HEVCContext *s)
         if (s->ps.pps->pic_slice_level_chroma_qp_offsets_present_flag) {
             sh->slice_cb_qp_offset = get_se_golomb(gb);
             sh->slice_cr_qp_offset = get_se_golomb(gb);
+            if (sh->slice_cb_qp_offset < -12 || sh->slice_cb_qp_offset > 12 ||
+                sh->slice_cr_qp_offset < -12 || sh->slice_cr_qp_offset > 12) {
+                av_log(s->avctx, AV_LOG_ERROR, "Invalid slice cx qp offset.\n");
+                return AVERROR_INVALIDDATA;
+            }
         } else {
             sh->slice_cb_qp_offset = 0;
             sh->slice_cr_qp_offset = 0;