ui-log: handle parse_commit() errors

If parse_commit() fails, none of the fields in the commit structure will
have been populated so we will dereference NULL when accessing
item->tree.

There isn't much we can do about the error at this point, but if we
return true then we'll try parsing the commit again from print_commit()
and we can report an error to the user at that point.

Coverity-id: 13801
Signed-off-by: John Keeping <john@keeping.me.uk>

1 files changed, 3 insertions, 1 deletions

diff --git a/ui-log.c b/ui-log.c
index 4573255..a4dc707 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -141,7 +141,9 @@ static int show_commit(struct commit *commit, struct rev_info *revs)
 
         /* When we get here we have precisely one parent. */
         parent = parents->item;
-        parse_commit(parent);
+        /* If we can't parse the commit, let print_commit() report an error. */
+        if (parse_commit(parent))
+                return 1;
 
         files = 0;
         add_lines = 0;