libavcodec/utils.c:361: error: Null Dereference
  pointer `buf` last assigned on line 351 could be null and is dereferenced at line 361, column 5.

libavcodec/utils.c:344:1: start of procedure avcodec_default_release_buffer()
342. }
343. 
344. void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
     ^
345.     int i;
346.     InternalBuffer *buf, *last;

libavcodec/utils.c:348:5: 
346.     InternalBuffer *buf, *last;
347. 
348.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
         ^
349.     assert(s->internal_buffer_count);
350. 

libavcodec/utils.c:349:5: 
347. 
348.     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
349.     assert(s->internal_buffer_count);
         ^
350. 
351.     buf = NULL; /* avoids warning */

libavcodec/utils.c:351:5: 
349.     assert(s->internal_buffer_count);
350. 
351.     buf = NULL; /* avoids warning */
         ^
352.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
353.         buf= &((InternalBuffer*)s->internal_buffer)[i];

libavcodec/utils.c:352:9: 
350. 
351.     buf = NULL; /* avoids warning */
352.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
             ^
353.         buf= &((InternalBuffer*)s->internal_buffer)[i];
354.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:352:14: Loop condition is false. Leaving loop
350. 
351.     buf = NULL; /* avoids warning */
352.     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
                  ^
353.         buf= &((InternalBuffer*)s->internal_buffer)[i];
354.         if(buf->data[0] == pic->data[0])

libavcodec/utils.c:357:5: 
355.             break;
356.     }
357.     assert(i < s->internal_buffer_count);
         ^
358.     s->internal_buffer_count--;
359.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

libavcodec/utils.c:358:5: 
356.     }
357.     assert(i < s->internal_buffer_count);
358.     s->internal_buffer_count--;
         ^
359.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
360. 

libavcodec/utils.c:359:5: 
357.     assert(i < s->internal_buffer_count);
358.     s->internal_buffer_count--;
359.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
         ^
360. 
361.     FFSWAP(InternalBuffer, *buf, *last);

libavcodec/utils.c:361:5: 
359.     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
360. 
361.     FFSWAP(InternalBuffer, *buf, *last);
         ^
362. 
363.     for(i=0; i<4; i++){

void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
    int i;
    InternalBuffer *buf, *last;
    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
    assert(s->internal_buffer_count);
    buf = NULL;
    for(i=0; i<s->internal_buffer_count; i++){
        buf= &((InternalBuffer*)s->internal_buffer)[i];
        if(buf->data[0] == pic->data[0])
            break;
    }
    assert(i < s->internal_buffer_count);
    s->internal_buffer_count--;
    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
    FFSWAP(InternalBuffer, *buf, *last);
    for(i=0; i<4; i++){
        pic->data[i]=NULL;
    }
    if(s->debug&FF_DEBUG_BUFFERS)
        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
}
['void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){\n    int i;\n    InternalBuffer *buf, *last;\n    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);\n    assert(s->internal_buffer_count);\n    buf = NULL;\n    for(i=0; i<s->internal_buffer_count; i++){\n        buf= &((InternalBuffer*)s->internal_buffer)[i];\n        if(buf->data[0] == pic->data[0])\n            break;\n    }\n    assert(i < s->internal_buffer_count);\n    s->internal_buffer_count--;\n    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];\n    FFSWAP(InternalBuffer, *buf, *last);\n    for(i=0; i<4; i++){\n        pic->data[i]=NULL;\n    }\n    if(s->debug&FF_DEBUG_BUFFERS)\n        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\\n", pic, s->internal_buffer_count);\n}']