libavcodec/utils.c:398: error: Null Dereference
  pointer `buf` last assigned on line 388 could be null and is dereferenced at line 398, column 5.

libavcodec/utils.c:380:1: start of procedure avcodec_default_release_buffer()
378. }
379. 
380. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
381.     int i;
382.     InternalBuffer *buf, *last;

libavcodec/utils.c:384:5: 
382.     InternalBuffer *buf, *last;
383. 
384.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
385.     assert(s->internal_buffer_count);
386. 

libavcodec/utils.c:385:5: 
383. 
384.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
385.     assert(s->internal_buffer_count);
         ^
386. 
387.     if(s->internal_buffer){

libavcodec/utils.c:387:8: Taking true branch
385.     assert(s->internal_buffer_count);
386. 
387.     if(s->internal_buffer){
            ^
388.     buf = NULL; /* avoids warning */
389.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize

libavcodec/utils.c:388:5: 
386. 
387.     if(s->internal_buffer){
388.     buf = NULL; /* avoids warning */
         ^
389.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
390.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:389:9: 
387.     if(s->internal_buffer){
388.     buf = NULL; /* avoids warning */
389.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
390.         buf= &((InternalBuffer*)s->internal_buffer)[i];
391.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:389:14: Loop condition is false. Leaving loop
387.     if(s->internal_buffer){
388.     buf = NULL; /* avoids warning */
389.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
390.         buf= &((InternalBuffer*)s->internal_buffer)[i];
391.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:394:5: 
392.             break;
393.     }
394.     assert(i < s->internal_buffer_count);
         ^
395.     s->internal_buffer_count--;
396.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:395:5: 
393.     }
394.     assert(i < s->internal_buffer_count);
395.     s->internal_buffer_count--;
         ^
396.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
397. 

libavcodec/utils.c:396:5: 
394.     assert(i < s->internal_buffer_count);
395.     s->internal_buffer_count--;
396.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
397. 
398.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:398:5: 
396.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
397. 
398.     FFSWAP(InternalBuffer, *buf, *last);
         ^
399.     }
400. 
