1 files changed, 19 insertions, 15 deletions

diff --git a/sha1_name.c b/sha1_name.c
index 13e1164..8358ba2 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -192,26 +192,25 @@ static int get_short_sha1(const char *name, int len, unsigned char *sha1,
 
 const char *find_unique_abbrev(const unsigned char *sha1, int len)
 {
-	int status, is_null;
+	int status, exists;
 	static char hex[41];
 
-	is_null = is_null_sha1(sha1);
+	exists = has_sha1_file(sha1);
 	memcpy(hex, sha1_to_hex(sha1), 40);
 	if (len == 40 || !len)
 		return hex;
 	while (len < 40) {
 		unsigned char sha1_ret[20];
 		status = get_short_sha1(hex, len, sha1_ret, 1);
-		if (!status ||
-		    (is_null && status != SHORT_NAME_AMBIGUOUS)) {
+		if (exists
+		    ? !status
+		    : status == SHORT_NAME_NOT_FOUND) {
 			hex[len] = 0;
 			return hex;
 		}
-		if (status != SHORT_NAME_AMBIGUOUS)
-			return NULL;
 		len++;
 	}
-	return NULL;
+	return hex;
 }
 
 static int ambiguous_path(const char *path, int len)
@@ -494,8 +493,11 @@ static int peel_onion(const char *name, int len, unsigned char *sha1)
 				return error("%.*s: expected %s type, but the object dereferences to %s type",
 					     len, name, typename(expected_type),
 					     typename(o->type));
+			if (!o)
+				return -1;
 			if (!o->parsed)
-				parse_object(o->sha1);
+				if (!parse_object(o->sha1))
+					return -1;
 		}
 	}
 	return 0;
@@ -578,8 +580,11 @@ static int handle_one_ref(const char *path,
 	struct object *object = parse_object(sha1);
 	if (!object)
 		return 0;
-	if (object->type == OBJ_TAG)
+	if (object->type == OBJ_TAG) {
 		object = deref_tag(object, path, strlen(path));
+		if (!object)
+			return 0;
+	}
 	if (object->type != OBJ_COMMIT)
 		return 0;
 	insert_by_date((struct commit *)object, list);
@@ -617,9 +622,9 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
 		unsigned long size;
 
 		commit = pop_most_recent_commit(&list, ONELINE_SEEN);
-		parse_object(commit->object.sha1);
-		if (temp_commit_buffer)
-			free(temp_commit_buffer);
+		if (!parse_object(commit->object.sha1))
+			continue;
+		free(temp_commit_buffer);
 		if (commit->buffer)
 			p = commit->buffer;
 		else {
@@ -636,8 +641,7 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
 			break;
 		}
 	}
-	if (temp_commit_buffer)
-		free(temp_commit_buffer);
+	free(temp_commit_buffer);
 	free_commit_list(list);
 	for (l = backup; l; l = l->next)
 		clear_commit_marks(l->item, ONELINE_SEEN);
@@ -695,7 +699,7 @@ int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
 				break;
 			if (ce_stage(ce) == stage) {
 				hashcpy(sha1, ce->sha1);
-				*mode = ntohl(ce->ce_mode);
+				*mode = ce->ce_mode;
 				return 0;
 			}
 			pos++;