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[3.19.y-ckt,stable] Patch "NFSv4: Fix a dentry leak on alias use" has been added to the 3.19.y-ckt tree

Message ID 1457483132-25586-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 9, 2016, 12:25 a.m. UTC 
This is a note to let you know that I have just added a patch titled

    NFSv4: Fix a dentry leak on alias use

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt16.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

From 2f40060d65f75324944d55e6e6408703a16f9337 Mon Sep 17 00:00:00 2001
From: Benjamin Coddington <bcodding@redhat.com>
Date: Wed, 17 Feb 2016 10:41:41 -0500
Subject: NFSv4: Fix a dentry leak on alias use

commit d9dfd8d741683347ee159d25f5b50c346a0df557 upstream.

In the case where d_add_unique() finds an appropriate alias to use it will
have already incremented the reference count.  An additional dget() to swap
the open context's dentry is unnecessary and will leak a reference.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Fixes: 275bb307865a3 ("NFSv4: Move dentry instantiation into the NFSv4-...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/nfs/nfs4proc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--
2.7.0
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Patch

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d05e5f3..2d2261d 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2253,9 +2253,9 @@  static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
 		dentry = d_add_unique(dentry, igrab(state->inode));
 		if (dentry == NULL) {
 			dentry = opendata->dentry;
-		} else if (dentry != ctx->dentry) {
+		} else {
 			dput(ctx->dentry);
-			ctx->dentry = dget(dentry);
+			ctx->dentry = dentry;
 		}
 		nfs_set_verifier(dentry,
 				nfs_save_change_attribute(opendata->dir->d_inode));