From: Chengguang Xu <cgxu519@gmx.com>
Date: Sun, 29 Jul 2018 19:51:54 +0000 (-0400)
Subject: ext4: check allocation failure when duplicating "data" in ext4_remount()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=21ac738ede0b49004b53b4a44fe3df7bb4a78280;p=openwrt%2Fstaging%2Fblogic.git

ext4: check allocation failure when duplicating "data" in ext4_remount()

There is no check for allocation failure when duplicating
"data" in ext4_remount(). Check for failure and return
error -ENOMEM in this case.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
---

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3e64d8d51ac4..d4a218ba626c 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5101,6 +5101,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 #endif
 	char *orig_data = kstrdup(data, GFP_KERNEL);
 
+	if (data && !orig_data)
+		return -ENOMEM;
+
 	/* Store the original options */
 	old_sb_flags = sb->s_flags;
 	old_opts.s_mount_opt = sbi->s_mount_opt;