pickaxe: plug diff filespec leak with empty needle

Check first for the unlikely case of an empty needle string and only
then populate the filespec, lest we leak it.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index c3760cfefd5dd123481b869eac3081b6e7d93201..0835a3be8d7b54e6654def5e7793cc0a38eed647 100644 (file)
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -152,10 +152,10 @@ static unsigned int contains(struct diff_filespec *one,
        unsigned int cnt;
        unsigned long sz;
        const char *data;
-       if (diff_populate_filespec(one, 0))
-               return 0;
        if (!len)
                return 0;
+       if (diff_populate_filespec(one, 0))
+               return 0;
 
        sz = one->size;
        data = one->data;