libavcodec/utils.c:285: error: Null Dereference
  pointer `desc` last assigned on line 284 could be null and is dereferenced at line 285, column 24.

libavcodec/utils.c:282:1: start of procedure avcodec_align_dimensions()
280. }
281. 
282. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
283. {
284.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:284:5: 
282. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
283. {
284.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
285.     int chroma_shift = desc->log2_chroma_w;
286.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1665:1: start of procedure av_pix_fmt_desc_get()
  1663. }
  1664. 
  1665. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1666. {
  1667.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1667:9: Taking false branch
  1665. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1666. {
  1667.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1668.         return NULL;
  1669.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1667:24: Taking true branch
  1665. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1666. {
  1667.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1668.         return NULL;
  1669.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1668:9: 
  1666. {
  1667.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1668.         return NULL;
                ^
  1669.     return &av_pix_fmt_descriptors[pix_fmt];
  1670. }

libavutil/pixdesc.c:1670:1: return from a call to av_pix_fmt_desc_get
  1668.         return NULL;
  1669.     return &av_pix_fmt_descriptors[pix_fmt];
  1670. }
        ^
  1671. 
  1672. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:285:5: 
283. {
284.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
285.     int chroma_shift = desc->log2_chroma_w;
         ^
286.     int linesize_align[AV_NUM_DATA_POINTERS];
287.     int align;

void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
{
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
    int chroma_shift = desc->log2_chroma_w;
    int linesize_align[AV_NUM_DATA_POINTERS];
    int align;
    avcodec_align_dimensions2(s, width, height, linesize_align);
    align               = FFMAX(linesize_align[0], linesize_align[3]);
    linesize_align[1] <<= chroma_shift;
    linesize_align[2] <<= chroma_shift;
    align               = FFMAX3(align, linesize_align[1], linesize_align[2]);
    *width              = FFALIGN(*width, align);
}
['void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)\n{\n    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);\n    int chroma_shift = desc->log2_chroma_w;\n    int linesize_align[AV_NUM_DATA_POINTERS];\n    int align;\n    avcodec_align_dimensions2(s, width, height, linesize_align);\n    align               = FFMAX(linesize_align[0], linesize_align[3]);\n    linesize_align[1] <<= chroma_shift;\n    linesize_align[2] <<= chroma_shift;\n    align               = FFMAX3(align, linesize_align[1], linesize_align[2]);\n    *width              = FFALIGN(*width, align);\n}', 'const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)\n{\n    if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)\n        return NULL;\n    return &av_pix_fmt_descriptors[pix_fmt];\n}']