linux-ext4 - [PATCH v2] ext4: Check allocation failure when duplicating "data" in ext4

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Date:   Wed, 20 Jun 2018 13:46:12 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     tytso@....edu, adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH v2] 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@....com>
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
---
v2:
- Modify changelog for easy understading.

 fs/ext4/super.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0c4c2201b3aa..f9c3da513cae 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5014,6 +5014,9 @@ 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;
-- 
2.17.1