[PATCH] line-log: fix crash when --first-parent is used

[Tzvetan Mikov <tmikov@gmail.com>]

line-log tries to access all parents of a commit, but only the first
parent has been loaded if "--first-parent" is specified, resulting
in a crash.

Limit the number of parents to one if "--first-parent" is specified.

Reported-by: Eric N. Vander Weele <ericvw@gmail.com>
Signed-off-by: Tzvetan Mikov <tmikov@gmail.com>
---
 line-log.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/line-log.c b/line-log.c
index 1008e72..86e7274 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1141,6 +1141,9 @@ static int process_ranges_merge_commit(struct rev_info *rev, struct commit *comm
 	int i;
 	int nparents = commit_list_count(commit->parents);
 
+	if (nparents > 1 && rev->first_parent_only)
+	    nparents = 1;
+
 	diffqueues = xmalloc(nparents * sizeof(*diffqueues));
 	cand = xmalloc(nparents * sizeof(*cand));
 	parents = xmalloc(nparents * sizeof(*parents));
-- 
1.9.1