commit 0e6ab4b2dda12fd56fa5ccb1cb3ff1aa12876891
from: Stefan Sperling <stsp@stsp.name>
date: Thu Mar 10 09:23:19 2022 UTC

make got_repo_match_object_id_prefix() reject overlong input strings

suggested by + ok naddy

commit - 0ed2285b0119b293d6b77b882c707c0377e176cd
commit + 0e6ab4b2dda12fd56fa5ccb1cb3ff1aa12876891
blob - 8885743e283c1cb4fc9c98d7c28f6d6732f33469
blob + d4175545865a20ba9a3cff43736298aaae5e8c37
--- lib/repository.c
+++ lib/repository.c
@@ -1671,13 +1671,16 @@ got_repo_match_object_id_prefix(struct got_object_id *
 
 	*id = NULL;
 
-	for (i = 0; i < strlen(id_str_prefix); i++) {
+	len = strlen(id_str_prefix);
+	if (len > SHA1_DIGEST_STRING_LENGTH - 1)
+		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
+
+	for (i = 0; i < len; i++) {
 		if (isxdigit((unsigned char)id_str_prefix[i]))
 			continue;
 		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
 	}
 
-	len = strlen(id_str_prefix);
 	if (len >= 2) {
 		err = match_packed_object(id, repo, id_str_prefix, obj_type);
 		if (err)