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avcodec/truemotion2: Fix integer overflow in tm2_null_res_block()

Fixes: signed integer overflow: 1111638592 - -2122219136 cannot be represented in type 'int'
Fixes: 13441/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEMOTION2_fuzzer-5732769815068672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1223696c725a8ea7e80498e6ccfab37eea179b76)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Michael Niedermayer authored on 2019/03/16 10:30:57
Showing 1 changed files

libavcodec/truemotion2.c index 2945d99..bc3f168 100644

libavcodec/truemotion2.c

History View file @ 807d443

@@ -587,7 +587,8 @@ static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
+                     {
                          int i;
                          int ct;
                     -    int left, right, diff;
                     +    unsigned left, right;
                     +    int diff;
                          int deltas[16];
                          TM2_INIT_POINTERS();