libavcodec/utils.c:346: error: Null Dereference
  pointer `buf` last assigned on line 336 could be null and is dereferenced at line 346, column 5.

libavcodec/utils.c:329:1: start of procedure avcodec_default_release_buffer()
327. }
328. 
329. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
330.     int i;
331.     InternalBuffer *buf, *last;

libavcodec/utils.c:333:5: 
331.     InternalBuffer *buf, *last;
332. 
333.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
334.     assert(s->internal_buffer_count);
335. 

libavcodec/utils.c:334:5: 
332. 
333.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
334.     assert(s->internal_buffer_count);
         ^
335. 
336.     buf = NULL; /* avoids warning */

libavcodec/utils.c:336:5: 
334.     assert(s->internal_buffer_count);
335. 
336.     buf = NULL; /* avoids warning */
         ^
337.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
338.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:337:9: 
335. 
336.     buf = NULL; /* avoids warning */
337.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
338.         buf= &((InternalBuffer*)s->internal_buffer)[i];
339.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:337:14: Loop condition is false. Leaving loop
335. 
336.     buf = NULL; /* avoids warning */
337.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
338.         buf= &((InternalBuffer*)s->internal_buffer)[i];
339.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:342:5: 
340.             break;
341.     }
342.     assert(i < s->internal_buffer_count);
         ^
343.     s->internal_buffer_count--;
344.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:343:5: 
341.     }
342.     assert(i < s->internal_buffer_count);
343.     s->internal_buffer_count--;
         ^
344.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
345. 

libavcodec/utils.c:344:5: 
342.     assert(i < s->internal_buffer_count);
343.     s->internal_buffer_count--;
344.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
345. 
346.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:346:5: 
344.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
345. 
346.     FFSWAP(InternalBuffer, *buf, *last);
         ^
347. 
348.     for(i=0; i<4; i++){
