Merge commit 'a55a70644872027fdf76a75edf12a09c9008880f' into release/2.4

* commit 'a55a70644872027fdf76a75edf12a09c9008880f':
  avi: Validate sample_size

Conflicts:
	libavformat/avidec.c

See: ca234639ac
See: c7369f3a4b
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/avidec.c

@@ -685,9 +685,23 @@ static int avi_read_header(AVFormatContext *s)
             default:
                 av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
             }
-            if (ast->sample_size < 0)
-                av_log(s, AV_LOG_WARNING, "sample size %d is invalid\n", ast->sample_size);
-            ast->sample_size = FFMAX(ast->sample_size, 0);
+
+            if (ast->sample_size < 0) {
+                if (s->error_recognition & AV_EF_EXPLODE) {
+                    av_log(s, AV_LOG_ERROR,
+                           "Invalid sample_size %d at stream %d\n",
+                           ast->sample_size,
+                           stream_index);
+                    goto fail;
+                }
+                av_log(s, AV_LOG_WARNING,
+                       "Invalid sample_size %d at stream %d "
+                       "setting it to 0\n",
+                       ast->sample_size,
+                       stream_index);
+                ast->sample_size = 0;
+            }
+
             if (ast->sample_size == 0) {
                 st->duration = st->nb_frames;
                 if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {