tools/target_dec_fuzzer: Check that FFv1 doesnt leave uninitialized memory in its buffers

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

tools/target_dec_fuzzer.c

@@ -129,7 +129,14 @@ static int fuzz_video_get_buffer(AVCodecContext *ctx, AVFrame *frame)
 
     frame->extended_data = frame->data;
     for (i = 0; i < 4 && size[i]; i++) {
-        frame->buf[i] = av_buffer_allocz(size[i]);
+        switch(ctx->codec_id) {
+        case AV_CODEC_ID_FFV1:
+            frame->buf[i] = av_buffer_alloc(size[i]);
+        break;
+        default:
+            frame->buf[i] = av_buffer_allocz(size[i]);
+        }
+
         if (!frame->buf[i])
             goto fail;
         frame->data[i] = frame->buf[i]->data;