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avcodec/mss3: Fix runtime error: signed integer overflow: -2146318336 - 2139696256 cannot be represented in type 'int'

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Fix is similar to rac_get_model_sym()
Fixes: 1483/clusterfuzz-testcase-minimized-6386507814273024
Fixes: 1485/clusterfuzz-testcase-minimized-6639880215986176

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-11 23:06:50 +02:00
parent 2752410c47
commit d05bdba242
1 changed files with 2 additions and 1 deletions
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libavcodec/mss3.c
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@ -389,9 +389,10 @@ static int rac_get_model_sym(RangeCoder *c, Model *m)
static int rac_get_model256_sym(RangeCoder *c, Model256 *m)
{
int prob, prob2, helper, val;
int val;
int start, end;
int ssym;
unsigned prob, prob2, helper;
prob2 = c->range;
c->range >>= MODEL_SCALE;