From: "Dmitry V. Levin" <ldv@xxxxxxxxxxxx>
This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 5f8d498d4364f544fee17125787a47553db02afa ]
Explicitly check show_devname method return code and bail out in case
of an error. This fixes regression introduced by commit 9d4d65748a5c.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/proc_namespace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
index 8db932d..a5644c4 100644
--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -196,6 +196,8 @@ static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
if (sb->s_op->show_devname) {
seq_puts(m, "device ");
err = sb->s_op->show_devname(m, mnt_path.dentry);
+ if (err)
+ goto out;
} else {
if (r->mnt_devname) {
seq_puts(m, "device ");
--
2.5.0
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