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avcodec/snow: Fix runtime error: signed integer overflow: 1086573993 + 1086573994 cannot be represented in type 'int'

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Fixes: 1871/clusterfuzz-testcase-minimized-5719950331215872

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 b9c032ebc0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-28 17:12:35 +02:00
parent 844cdd2a6c
commit ea8984650c
1 changed files with 2 additions and 1 deletions
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libavcodec/snow.h
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@ -551,7 +551,8 @@ static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
if(get_rac(c, state+0))
return 0;
else{
int i, e, a;
int i, e;
unsigned a;
e= 0;
while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
e++;