[FFmpeg-cvslog] avcodec/ffv1dec: Fix integer overflow in read_quant_table()
Michael Niedermayer
git at videolan.org
Thu Oct 26 20:13:22 EEST 2017
ffmpeg | branch: release/3.0 | Michael Niedermayer <michael at niedermayer.cc> | Mon Sep 18 17:26:09 2017 +0200| [3386a57b086f91bf7e3053523f3b8d233f2dd357] | committer: Michael Niedermayer
avcodec/ffv1dec: Fix integer overflow in read_quant_table()
Fixes: runtime error: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int'
Fixes: 3361/clusterfuzz-testcase-minimized-5065842955911168
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 d00fc952b6c261dd8eb0f7552b9ccf985dbc2b20)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3386a57b086f91bf7e3053523f3b8d233f2dd357
---
libavcodec/ffv1dec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 5f7e11fc33..b92c3b3706 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -483,7 +483,7 @@ static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
memset(state, 128, sizeof(state));
for (v = 0; i < 128; v++) {
- unsigned len = get_symbol(c, state, 0) + 1;
+ unsigned len = get_symbol(c, state, 0) + 1U;
if (len > 128 - i || !len)
return AVERROR_INVALIDDATA;
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