[FFmpeg-cvslog] avcodec/pnm_parser: Check image size addition for overflow
Michael Niedermayer
git at videolan.org
Thu Apr 1 12:50:21 EEST 2021
ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Tue Mar 30 13:22:14 2021 +0200| [829d4b009f87fe634af20343a142794e8c5889e9] | committer: Michael Niedermayer
avcodec/pnm_parser: Check image size addition for overflow
Fixes: assertion failure
Fixes: out of array access
Fixes: 32664/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGMYUV_fuzzer-6533642202513408.fuzz
Fixes: 32669/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGMYUV_fuzzer-6001928875147264
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 79ac8d55468adc9cb9a0908e671807a2a789b7d0)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=829d4b009f87fe634af20343a142794e8c5889e9
---
libavcodec/pnm_parser.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/pnm_parser.c b/libavcodec/pnm_parser.c
index f3be6d640c..a822c17a2e 100644
--- a/libavcodec/pnm_parser.c
+++ b/libavcodec/pnm_parser.c
@@ -111,7 +111,7 @@ retry:
} else {
int ret = av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1);
next = pnmctx.bytestream - pnmctx.bytestream_start + skip;
- if (ret >= 0)
+ if (ret >= 0 && next + (uint64_t)ret <= INT_MAX)
next += ret;
}
if (next != END_NOT_FOUND && pnmctx.bytestream_start != buf + skip)
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