From: Al Viro <viro@www.linux.org.uk>
Date: Mon, 6 Jun 2005 20:36:01 +0000 (-0700)
Subject: [PATCH] namei fixes (5/19)
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1be4a0900be5d2c2fd9cd012e3a153e1ea47b96a;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] namei fixes (5/19)

fix for too early mntput() in open_namei() - we pin path.mnt down for the
duration of __do_follow_link().  Otherwise we could get the fs where our
symlink lived unmounted while we were in __do_follow_link().  That would end
up with dentry of symlink staying pinned down through the fs shutdown.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/namei.c b/fs/namei.c
index e42f7c35545a..020fb8c8d1cd 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1524,8 +1524,10 @@ do_link:
 	error = security_inode_follow_link(path.dentry, nd);
 	if (error)
 		goto exit_dput;
+	mntget(path.mnt);
 	error = __do_follow_link(path.dentry, nd);
 	dput(path.dentry);
+	mntput(path.mnt);
 	path.mnt = nd->mnt;
 	if (error)
 		return error;