Merge branch 'bc/fix-cherry-pick-root' into maint

* bc/fix-cherry-pick-root:
  builtin/revert.c: don't dereference a NULL pointer

builtin/revert.c

@@ -442,7 +442,7 @@ static int do_pick_commit(void)
 	else
 		parent = commit->parents->item;
 
-	if (allow_ff && !hashcmp(parent->object.sha1, head))
+	if (allow_ff && parent && !hashcmp(parent->object.sha1, head))
 		return fast_forward_to(commit->object.sha1, head);
 
 	if (parent && parse_commit(parent) < 0)

t/t3506-cherry-pick-ff.sh

@@ -95,4 +95,14 @@ test_expect_success 'cherry pick a merge relative to nonexistent parent with --f
 	test_must_fail git cherry-pick --ff -m 3 C
 '
 
+test_expect_success 'cherry pick a root commit with --ff' '
+	git reset --hard first -- &&
+	git rm file1 &&
+	echo first >file2 &&
+	git add file2 &&
+	git commit --amend -m "file2" &&
+	git cherry-pick --ff first &&
+	test "$(git rev-parse --verify HEAD)" = "1df192cd8bc58a2b275d842cede4d221ad9000d1"
+'
+
 test_done