linux-kernel - [PATCH 01/18] sysfs: check return value of kernfs_get

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Date:   Sun,  8 Jul 2018 14:01:37 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     David Howells <dhowells@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH 01/18] sysfs: check return value of kernfs_get_tree()

From: Eric Biggers <ebiggers@...gle.com>

Reported-by: syzbot+0977fcb74b8a12a967b8@...kaller.appspotmail.com
Fixes: a5195193b1e5 ("kernfs, sysfs, cgroup, intel_rdt: Support fs_context")
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/sysfs/mount.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 0a016dd49300a..1e1c0ccc6a367 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -27,6 +27,9 @@ static int sysfs_get_tree(struct fs_context *fc)
 	int ret;
 
 	ret = kernfs_get_tree(fc);
+	if (ret)
+		return ret;
+
 	if (kfc->new_sb_created)
 		fc->root->d_sb->s_iflags |= SB_I_USERNS_VISIBLE;
 	return 0;
-- 
2.18.0