avfilter/avfilter: check allocation failure in ff_insert_pad()

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/avfilter.c

@@ -94,16 +94,25 @@ void ff_command_queue_pop(AVFilterContext *filter)
     av_free(c);
 }
 
-void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                    AVFilterPad **pads, AVFilterLink ***links,
                    AVFilterPad *newpad)
 {
+    AVFilterLink **newlinks;
+    AVFilterPad *newpads;
     unsigned i;
 
     idx = FFMIN(idx, *count);
 
-    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
-    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
+    newpads  = av_realloc_array(*pads,  *count + 1, sizeof(AVFilterPad));
+    newlinks = av_realloc_array(*links, *count + 1, sizeof(AVFilterLink*));
+    if (newpads)
+        *pads  = newpads;
+    if (newlinks)
+        *links = newlinks;
+    if (!newpads || !newlinks)
+        return AVERROR(ENOMEM);
+
     memmove(*pads  + idx + 1, *pads  + idx, sizeof(AVFilterPad)   * (*count - idx));
     memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));
     memcpy(*pads + idx, newpad, sizeof(AVFilterPad));
@@ -113,6 +122,8 @@ void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
     for (i = idx + 1; i < *count; i++)
         if (*links[i])
             (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
+
+    return 0;
 }
 
 int avfilter_link(AVFilterContext *src, unsigned srcpad,

libavfilter/internal.h

@@ -249,35 +249,38 @@ void ff_tlog_link(void *ctx, AVFilterLink *link, int end);
  * @param pads Pointer to the pointer to the beginning of the list of pads
  * @param links Pointer to the pointer to the beginning of the list of links
  * @param newpad The new pad to add. A copy is made when adding.
+ * @return >= 0 in case of success, a negative AVERROR code on error
  */
-void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
+int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                    AVFilterPad **pads, AVFilterLink ***links,
                    AVFilterPad *newpad);
 
 /** Insert a new input pad for the filter. */
-static inline void ff_insert_inpad(AVFilterContext *f, unsigned index,
+static inline int ff_insert_inpad(AVFilterContext *f, unsigned index,
                                    AVFilterPad *p)
 {
-    ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
+    int ret = ff_insert_pad(index, &f->nb_inputs, offsetof(AVFilterLink, dstpad),
                   &f->input_pads, &f->inputs, p);
 #if FF_API_FOO_COUNT
 FF_DISABLE_DEPRECATION_WARNINGS
     f->input_count = f->nb_inputs;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
+    return ret;
 }
 
 /** Insert a new output pad for the filter. */
-static inline void ff_insert_outpad(AVFilterContext *f, unsigned index,
+static inline int ff_insert_outpad(AVFilterContext *f, unsigned index,
                                     AVFilterPad *p)
 {
-    ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
+    int ret = ff_insert_pad(index, &f->nb_outputs, offsetof(AVFilterLink, srcpad),
                   &f->output_pads, &f->outputs, p);
 #if FF_API_FOO_COUNT
 FF_DISABLE_DEPRECATION_WARNINGS
     f->output_count = f->nb_outputs;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
+    return ret;
 }
 
 /**