libavcodec/utils.c:271: error: Null Dereference
  pointer `desc` last assigned on line 270 could be null and is dereferenced at line 271, column 24.

libavcodec/utils.c:268:1: start of procedure avcodec_align_dimensions()
266. }
267. 
268. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
269. {
270.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:270:5: 
268. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
269. {
270.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
271.     int chroma_shift = desc->log2_chroma_w;
272.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1901:1: start of procedure av_pix_fmt_desc_get()
  1899. }
  1900. 
  1901. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1902. {
  1903.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1903:9: Taking false branch
  1901. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1902. {
  1903.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1904.         return NULL;
  1905.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1903:24: Taking true branch
  1901. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1902. {
  1903.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1904.         return NULL;
  1905.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1904:9: 
  1902. {
  1903.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1904.         return NULL;
                ^
  1905.     return &av_pix_fmt_descriptors[pix_fmt];
  1906. }

libavutil/pixdesc.c:1906:1: return from a call to av_pix_fmt_desc_get
  1904.         return NULL;
  1905.     return &av_pix_fmt_descriptors[pix_fmt];
  1906. }
        ^
  1907. 
  1908. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:271:5: 
269. {
270.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
271.     int chroma_shift = desc->log2_chroma_w;
         ^
272.     int linesize_align[AV_NUM_DATA_POINTERS];
273.     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}']