From: Shen Feng <shen@cn.fujitsu.com>
Date: Mon, 14 Jul 2008 01:03:31 +0000 (-0400)
Subject: ext4: error proc entry creation when the fs/ext4 is not correctly created
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cfbe7e4f5e4a0e1fc2ff23b167bfb3fa992f623d;p=firefly-linux-kernel-4.4.55.git

ext4: error proc entry creation when the fs/ext4 is not correctly created

When the directory fs/ext4 is not correctly created under proc, the entry
under this directory should not be created.

Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 21ee6d42ee7b..771a1d608528 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2661,6 +2661,10 @@ static int ext4_mb_init_per_dev_proc(struct super_block *sb)
 	struct proc_dir_entry *proc;
 	char devname[64];
 
+	if (proc_root_ext4 == NULL) {
+		sbi->s_mb_proc = NULL;
+		return -EINVAL;
+	}
 	bdevname(sb->s_bdev, devname);
 	sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4);