ui-refs.c: avoid segfault on unparsed ref objects

When a ref refers to something other then a commit or tag object, cgit
could segfault when trying to display the tag info.

Noticed-by: Eugene Sajine <euguess@gmail.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 14 insertions, 12 deletions

diff --git a/ui-refs.c b/ui-refs.c
index d3b4f6e..6571cc4 100644
--- a/ui-refs.c
+++ b/ui-refs.c
@@ -42,23 +42,25 @@ static int cmp_branch_age(const void *a, const void *b)
         return cmp_age(r1->commit->committer_date, r2->commit->committer_date);
 }
 
+static int get_ref_age(struct refinfo *ref)
+{
+        if (!ref->object)
+                return 0;
+        switch (ref->object->type) {
+        case OBJ_TAG:
+                return ref->tag ? ref->tag->tagger_date : 0;
+        case OBJ_COMMIT:
+                return ref->commit ? ref->commit->committer_date : 0;
+        }
+        return 0;
+}
+
 static int cmp_tag_age(const void *a, const void *b)
 {
         struct refinfo *r1 = *(struct refinfo **)a;
         struct refinfo *r2 = *(struct refinfo **)b;
-        int r1date, r2date;
-
-        if (r1->object->type != OBJ_COMMIT)
-                r1date = r1->tag->tagger_date;
-        else
-                r1date = r1->commit->committer_date;
-
-        if (r2->object->type != OBJ_COMMIT)
-                r2date = r2->tag->tagger_date;
-        else
-                r2date = r2->commit->committer_date;
 
-        return cmp_age(r1date, r2date);
+        return cmp_age(get_ref_age(r1), get_ref_age(r2));
 }
 
 static int print_branch(struct refinfo *ref)