avcodec/snowdec: Fix off by 1 error
authorMichael Niedermayer <michael@niedermayer.cc>
Thu, 17 Aug 2017 18:32:03 +0000 (20:32 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Sun, 20 Aug 2017 00:59:57 +0000 (02:59 +0200)
Fixes: runtime error: index 4 out of bounds for type 'int8_t [4]'
Fixes: 3023/clusterfuzz-testcase-minimized-6421736130084864

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/snowdec.c

index c80901b..734f43e 100644 (file)
@@ -355,7 +355,7 @@ static int decode_header(SnowContext *s){
                 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)
+                if((unsigned)htaps >= HTAPS_MAX || htaps==0)
                     return AVERROR_INVALIDDATA;
                 p->htaps= htaps;
                 for(i= htaps/2; i; i--){