diff --color-moved-ws: fix a memory leak

Don't duplicate the indentation string if we're not going to use it.
This was found with asan.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/diff.c b/diff.c
index 6f12212..38f2609 100644
--- a/diff.c
+++ b/diff.c
@@ -811,10 +811,13 @@ static int compute_ws_delta(const struct emitted_diff_symbol *a,
 	const struct emitted_diff_symbol *shorter = a->len > b->len ? b : a;
 	int d = longer->len - shorter->len;
 
+	if (strncmp(longer->line + d, shorter->line, shorter->len))
+		return 0;
+
 	out->string = xmemdupz(longer->line, d);
 	out->current_longer = (a == longer);
 
-	return !strncmp(longer->line + d, shorter->line, shorter->len);
+	return 1;
 }
 
 static int cmp_in_block_with_wsd(const struct diff_options *o,