avformat/vividas: check if size is enough big in xor_block

e9909fe1 · Paul B Mahol · 14c2f7f6 · e9909fe1
Commit e9909fe1 authored Dec 22, 2018 by Paul B Mahol
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vividas.c libavformat/vividas.c +2 -1

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--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -129,11 +129,12 @@ static void xor_block(void *p1, void *p2, unsigned size, int key, unsigned *key_
    size >>= 2;
-    while (size--) {
+    while (size > 0) {
        *d2 = *d1 ^ k;
        k += key;
        d1++;
        d2++;
+        size--;
    }
    *key_ptr = k;