check_aliased_update: strcpy() instead of strcat() to copy

da3efdb (receive-pack: detect aliased updates which can occur with
symrefs, 2010-04-19) introduced two strcat() into uninitialized
strings.  The intent was clearly make a copy of the static buffer used
by find_unique_abbrev(), so use strcpy() instead.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Tested-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-receive-pack.c b/builtin-receive-pack.c
index bb34757d27f32fff8cb15a8f99d8295b5e38cb9e..7e4129ddc85e1408300947ff9c041524a1c10f48 100644 (file)
--- a/builtin-receive-pack.c
+++ b/builtin-receive-pack.c
@@ -515,9 +515,9 @@ static void check_aliased_update(struct command *cmd, struct string_list *list)
        dst_cmd->skip_update = 1;
 
        strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
-       strcat(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
+       strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
        strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
-       strcat(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
+       strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
        rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
                 " its target '%s' (%s..%s)",
                 cmd->ref_name, cmd_oldh, cmd_newh,