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avcodec/snowdec: Fix integer overflow before htaps check 

Fixes: runtime error: signed integer overflow: -1094995529 * 2 cannot be represented in type 'int'
Fixes: 4828/clusterfuzz-testcase-minimized-5100849937252352

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-01-15 03:03:36 +01:00
parent 725353525e
commit 2eecf3cf8e
1 changed files with 3 additions and 2 deletions
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5
libavcodec/snowdec.c
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@ -363,9 +363,10 @@ static int decode_header(SnowContext *s){
int htaps, i, sum=0;
Plane *p= &s->plane[plane_index];
p->diag_mc= get_rac(&s->c, s->header_state);
htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
if((unsigned)htaps >= HTAPS_MAX || htaps==0)
htaps= get_symbol(&s->c, s->header_state, 0);
if((unsigned)htaps >= HTAPS_MAX/2 - 1)
return AVERROR_INVALIDDATA;
htaps = htaps*2 + 2;
p->htaps= htaps;
for(i= htaps/2; i; i--){
p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));