libavformat/movenchint.c:241: error: Use After Free
  call to `sample_queue_pop()` eventually accesses memory that was invalidated by call to `free()` on line 241 indirectly during the call to `sample_queue_pop()`.

libavformat/movenchint.c:212:1: invalidation part of the trace starts here
210.  * @return 0 if a match was found, < 0 if no match was found
211.  */
212. static int find_sample_match(const uint8_t *data, int len,
     ^
213.                              HintSampleQueue *queue, int *pos,
214.                              int *match_sample, int *match_offset,

libavformat/movenchint.c:212:1: parameter `queue` of find_sample_match
  210.  * @return 0 if a match was found, < 0 if no match was found
  211.  */
  212. static int find_sample_match(const uint8_t *data, int len,
       ^
  213.                              HintSampleQueue *queue, int *pos,
  214.                              int *match_sample, int *match_offset,

libavformat/movenchint.c:241:13: when calling `sample_queue_pop` here
  239.         } else {
  240.             /* No match for this sample, remove it */
  241.             sample_queue_pop(queue);
                   ^
  242.         }
  243.     }

libavformat/movenchint.c:68:1: parameter `queue` of sample_queue_pop
    66.  * Remove the first sample from the sample queue.
    67.  */
    68. static void sample_queue_pop(HintSampleQueue *queue)
        ^
    69. {
    70.     if (queue->len <= 0)

libavformat/movenchint.c:73:9: when calling `av_free` here
    71.         return;
    72.     if (queue->samples[0].own_data)
    73.         av_free(queue->samples[0].data);
                ^
    74.     queue->len--;
    75.     memmove(queue->samples, queue->samples + 1, sizeof(HintSample)*queue->len);

libavutil/mem.c:139:1: parameter `ptr` of av_free
      137. }
      138. 
      139. void av_free(void *ptr)
           ^
      140. {
      141. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:145:5: was invalidated by call to `free()`
      143.         free((char*)ptr - ((char*)ptr)[-1]);
      144. #else
      145.     free(ptr);
               ^
      146. #endif
      147. }

libavformat/movenchint.c:212:1: use-after-lifetime part of the trace starts here
210.  * @return 0 if a match was found, < 0 if no match was found
211.  */
212. static int find_sample_match(const uint8_t *data, int len,
     ^
213.                              HintSampleQueue *queue, int *pos,
214.                              int *match_sample, int *match_offset,

libavformat/movenchint.c:212:1: parameter `queue` of find_sample_match
  210.  * @return 0 if a match was found, < 0 if no match was found
  211.  */
  212. static int find_sample_match(const uint8_t *data, int len,
       ^
  213.                              HintSampleQueue *queue, int *pos,
  214.                              int *match_sample, int *match_offset,

libavformat/movenchint.c:241:13: when calling `sample_queue_pop` here
  239.         } else {
  240.             /* No match for this sample, remove it */
  241.             sample_queue_pop(queue);
                   ^
  242.         }
  243.     }

libavformat/movenchint.c:68:1: parameter `queue` of sample_queue_pop
    66.  * Remove the first sample from the sample queue.
    67.  */
    68. static void sample_queue_pop(HintSampleQueue *queue)
        ^
    69. {
    70.     if (queue->len <= 0)

libavformat/movenchint.c:73:9: when calling `av_free` here
    71.         return;
    72.     if (queue->samples[0].own_data)
    73.         av_free(queue->samples[0].data);
                ^
    74.     queue->len--;
    75.     memmove(queue->samples, queue->samples + 1, sizeof(HintSample)*queue->len);

libavutil/mem.c:139:1: parameter `ptr` of av_free
      137. }
      138. 
      139. void av_free(void *ptr)
           ^
      140. {
      141. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:145:5: invalid access occurs here
      143.         free((char*)ptr - ((char*)ptr)[-1]);
      144. #else
      145.     free(ptr);
               ^
      146. #endif
      147. }
