[FFmpeg-devel] [PATCH 5/5] avcodec/cfhd: check peak.offset so it stays within the 32bit range

[Michael Niedermayer]

Fixes: signed integer overflow: -2147483648 - 4 cannot be represented in type 'int'
Fixes: 26907/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-5746202330267648

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/cfhd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index a2b9c7c76a..e3fbfa4b91 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -617,6 +617,10 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
             s->peak.level   = 0;
         } else if (tag == -PeakLevel && s->peak.offset) {
             s->peak.level = data;
+            if (s->peak.offset < INT_MIN + 4) {
+                ret = AVERROR_INVALIDDATA;
+                goto end;
+            }
             bytestream2_seek(&s->peak.base, s->peak.offset - 4, SEEK_CUR);
         } else
             av_log(avctx, AV_LOG_DEBUG,  "Unknown tag %i data %x\n", tag, data);
-- 
2.17.1