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-rw-r--r--diff-delta.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/diff-delta.c b/diff-delta.c
index e49643353b..77fea08dfb 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -326,6 +326,8 @@ create_delta(const struct delta_index *index,
const unsigned char *ref_data, *ref_top, *data, *top;
unsigned char *out;
+ *delta_size = 0;
+
if (!trg_buf || !trg_size)
return NULL;