From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Wed, 8 Feb 2017 16:29:46 +0000 (-0500)
Subject: NFSv4: Fix memory and state leak in _nfs4_open_and_get_state
X-Git-Tag: v4.11-rc1~33^2~28
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a974deee47;p=karo-tx-linux.git

NFSv4: Fix memory and state leak in _nfs4_open_and_get_state

If we exit because the file access check failed, we currently
leak the struct nfs4_state. We need to attach it to the
open context before returning.

Fixes: 3efb9722475e ("NFSv4: Refactor _nfs4_open_and_get_state..")
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index aeaa6678b071..45271e5994f0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2624,6 +2624,7 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
 	ret = PTR_ERR(state);
 	if (IS_ERR(state))
 		goto out;
+	ctx->state = state;
 	if (server->caps & NFS_CAP_POSIX_LOCK)
 		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
 	if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
@@ -2649,7 +2650,6 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
 	if (ret != 0)
 		goto out;
 
-	ctx->state = state;
 	if (d_inode(dentry) == state->inode) {
 		nfs_inode_attach_open_context(ctx);
 		if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))