libavcodec/imgconvert.c:977: error: Null Dereference
  pointer `buf` last assigned on line 974 could be null and is dereferenced by call to `memcpy()` at line 977, column 5.

libavcodec/imgconvert.c:968:1: start of procedure deinterlace_bottom_field_inplace()
966. }
967. 
968. static void deinterlace_bottom_field_inplace(uint8_t *src1, int src_wrap,
     ^
969.                                              int width, int height)
970. {

libavcodec/imgconvert.c:974:5: 
972.     int y;
973.     uint8_t *buf;
974.     buf = av_malloc(width);
         ^
975. 
976.     src_m1 = src1;

libavutil/mem.c:64:1: start of procedure av_malloc()
  62.  * linker will do it automatically. */
  63. 
  64. void *av_malloc(size_t size)
      ^
  65. {
  66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
  64. void *av_malloc(size_t size)
  65. {
  66.     void *ptr = NULL;
          ^
  67. #if CONFIG_MEMALIGN_HACK
  68.     long diff;

libavutil/mem.c:72:9: Taking true branch
  70. 
  71.     /* let's disallow possible ambiguous cases */
  72.     if (size > (INT_MAX - 32) || !size)
              ^
  73.         return NULL;
  74. 

libavutil/mem.c:73:9: 
  71.     /* let's disallow possible ambiguous cases */
  72.     if (size > (INT_MAX - 32) || !size)
  73.         return NULL;
              ^
  74. 
  75. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:117:1: return from a call to av_malloc
  115. #endif
  116.     return ptr;
  117. }
       ^
  118. 
  119. void *av_realloc(void *ptr, size_t size)

libavcodec/imgconvert.c:976:5: 
974.     buf = av_malloc(width);
975. 
976.     src_m1 = src1;
         ^
977.     memcpy(buf,src_m1,width);
978.     src_0=&src_m1[src_wrap];

libavcodec/imgconvert.c:977:5: 
975. 
976.     src_m1 = src1;
977.     memcpy(buf,src_m1,width);
         ^
978.     src_0=&src_m1[src_wrap];
979.     src_p1=&src_0[src_wrap];
