btrfsprogs/0137-Btrfs-progs-fail-gracefully-on-error-from-open_ctree.patch

From 670b953e28c25f835b713a22b03b9b0f86d8e025 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@gmail.com>
Date: Tue, 1 Nov 2011 23:47:22 +0200
Subject: [PATCH 137/138] Btrfs-progs: fail gracefully on error from
 open_ctree()

Error checking block got moved mistakenly exposing us to a potential
segmentation fault.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 mkfs.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/mkfs.c b/mkfs.c
index d39c5a7..d4d13af 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1359,7 +1359,12 @@ int main(int ac, char **av)
 		fprintf(stderr, "error during mkfs %d\n", ret);
 		exit(1);
 	}
+
 	root = open_ctree(file, 0, O_RDWR);
+	if (!root) {
+		fprintf(stderr, "ctree init failed\n");
+		return -1;
+	}
 	root->fs_info->alloc_start = alloc_start;
 
 	ret = make_root_dir(root, mixed);
@@ -1374,10 +1379,6 @@ int main(int ac, char **av)
 		goto raid_groups;
 
 	btrfs_register_one_device(file);
-	if (!root) {
-		fprintf(stderr, "ctree init failed\n");
-		return -1;
-	}
 
 	zero_end = 1;
 	while(ac-- > 0) {
-- 
1.7.6.233.gd79bc