Fix valgrind and asan memory leaks and crashes.

libavcodec/vp3.c

Index: libavcodec/vp3.c
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index b5daafcefb34d6050795643050735ef20560ca8e..e465df149b18887295927f605d559f2a705a7b30 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -1631,6 +1631,7 @@ static av_cold int allocate_tables(AVCodecContext *avctx)
     s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
     s->coded_fragment_list[0] = av_malloc(s->fragment_count * sizeof(int));
     s->dct_tokens_base = av_malloc(64*s->fragment_count * sizeof(*s->dct_tokens_base));
+    memset(s->dct_tokens_base, 0, 64*s->fragment_count * sizeof(*s->dct_tokens_base));

[rbultje1, 2012/02/08 23:51:56]

Use av_mallocz() instead of av_malloc() to zero it automatically.

[DaleCurtis, 2012/02/09 04:03:28]

Done.

     s->motion_val[0] = av_malloc(y_fragment_count * sizeof(*s->motion_val[0]));
     s->motion_val[1] = av_malloc(c_fragment_count * sizeof(*s->motion_val[1]));