libavcodec/utils.c:290: error: Null Dereference
  pointer `desc` last assigned on line 289 could be null and is dereferenced at line 290, column 24.

libavcodec/utils.c:287:1: start of procedure avcodec_align_dimensions()
285. }
286. 
287. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
288. {
289.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:289:5: 
287. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
288. {
289.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
290.     int chroma_shift = desc->log2_chroma_w;
291.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1892:1: start of procedure av_pix_fmt_desc_get()
  1890. }
  1891. 
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1894:9: Taking false branch
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1894:24: Taking true branch
  1892. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1895:9: 
  1893. {
  1894.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1895.         return NULL;
                ^
  1896.     return &av_pix_fmt_descriptors[pix_fmt];
  1897. }

libavutil/pixdesc.c:1897:1: return from a call to av_pix_fmt_desc_get
  1895.         return NULL;
  1896.     return &av_pix_fmt_descriptors[pix_fmt];
  1897. }
        ^
  1898. 
  1899. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:290:5: 
288. {
289.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
290.     int chroma_shift = desc->log2_chroma_w;
         ^
291.     int linesize_align[AV_NUM_DATA_POINTERS];
292.     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}']