libavfilter/vsrc_color.c:123: error: Null Dereference
  pointer `pix_desc` last assigned on line 121 could be null and is dereferenced at line 123, column 19.

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

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

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

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

libavutil/pixdesc.c:1199:1: start of procedure av_pix_fmt_desc_get()
  1197. }
  1198. 
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1201:9: Taking false branch
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1201:24: Taking true branch
  1199. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1202:9: 
  1200. {
  1201.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1202.         return NULL;
                ^
  1203.     return &av_pix_fmt_descriptors[pix_fmt];
  1204. }

libavutil/pixdesc.c:1204:1: return from a call to av_pix_fmt_desc_get
  1202.         return NULL;
  1203.     return &av_pix_fmt_descriptors[pix_fmt];
  1204. }
        ^
  1205. 
  1206. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavfilter/vsrc_color.c:123:5: 
121.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
122. 
123.     color->hsub = pix_desc->log2_chroma_w;
         ^
124.     color->vsub = pix_desc->log2_chroma_h;
125. 
