Fix potential NULL pointer dereference

diff --git a/libhb/fifo.c b/libhb/fifo.c
index 4288f57002fcfa6d991a2354123e050c35c88ff6..70c3eca8177f7573de946667985675a04f609d69 100644 (file)
--- a/libhb/fifo.c
+++ b/libhb/fifo.c
@@ -450,8 +450,11 @@ void hb_buffer_realloc( hb_buffer_t * b, int size )
         {
             return;
         }
-        memcpy(tmp, b->data, b->alloc);
-        av_free(b->data);
+        if (b->data != NULL)
+        {
+            memcpy(tmp, b->data, b->alloc);
+            av_free(b->data);
+        }
         b->data  = tmp;
         b->alloc = size;