libavfilter/vsrc_color.c:122: error: Null Dereference
  pointer `pix_desc` last assigned on line 120 could be null and is dereferenced at line 122, column 19.

libavfilter/vsrc_color.c:114:1: start of procedure color_config_props()
112. }
113. 
114. static int color_config_props(AVFilterLink *inlink)
     ^
115. {
116.     AVFilterContext *ctx = inlink->src;

libavfilter/vsrc_color.c:116:5: 
114. static int color_config_props(AVFilterLink *inlink)
115. {
116.     AVFilterContext *ctx = inlink->src;
         ^
117.     ColorContext *color = ctx->priv;
118.     uint8_t rgba_color[4];

libavfilter/vsrc_color.c:117:5: 
115. {
116.     AVFilterContext *ctx = inlink->src;
117.     ColorContext *color = ctx->priv;
         ^
118.     uint8_t rgba_color[4];
119.     int is_packed_rgba;

libavfilter/vsrc_color.c:120:5: 
118.     uint8_t rgba_color[4];
119.     int is_packed_rgba;
120.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
         ^
121. 
122.     color->hsub = pix_desc->log2_chroma_w;

libavutil/pixdesc.c:1464:1: start of procedure av_pix_fmt_desc_get()
  1462. }
  1463. 
  1464. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1465. {
  1466.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1466:9: Taking false branch
  1464. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1465. {
  1466.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1467.         return NULL;
  1468.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1466:24: Taking true branch
  1464. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1465. {
  1466.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1467.         return NULL;
  1468.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1467:9: 
  1465. {
  1466.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1467.         return NULL;
                ^
  1468.     return &av_pix_fmt_descriptors[pix_fmt];
  1469. }

libavutil/pixdesc.c:1469:1: return from a call to av_pix_fmt_desc_get
  1467.         return NULL;
  1468.     return &av_pix_fmt_descriptors[pix_fmt];
  1469. }
        ^
  1470. 
  1471. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavfilter/vsrc_color.c:122:5: 
120.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
121. 
122.     color->hsub = pix_desc->log2_chroma_w;
         ^
123.     color->vsub = pix_desc->log2_chroma_h;
124. 
