shorten_unambiguous_ref: use xsnprintf

We convert the ref_rev_parse_rules array into scanf formats
on the fly, and use snprintf() to write into each string. We
should have enough memory to hold everything because of the
earlier total_len computation. Let's use xsnprintf() to
give runtime confirmation that this is the case, and to make
it easy for people auditing the code to know there's no
truncation bug.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/refs.c b/refs.c
index 20ba82b434..bd7ac72aa7 100644
--- a/refs.c
+++ b/refs.c
@@ -1132,8 +1132,8 @@ char *shorten_unambiguous_ref(const char *refname, int strict)
 		for (i = 0; i < nr_rules; i++) {
 			assert(offset < total_len);
 			scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset;
-			offset += snprintf(scanf_fmts[i], total_len - offset,
-					   ref_rev_parse_rules[i], 2, "%s") + 1;
+			offset += xsnprintf(scanf_fmts[i], total_len - offset,
+					    ref_rev_parse_rules[i], 2, "%s") + 1;
 		}
 	}