NFSv4: Fix a dentry leak on alias use
authorBenjamin Coddington <bcodding@redhat.com>
Wed, 17 Feb 2016 15:41:41 +0000 (10:41 -0500)
committerTrond Myklebust <trond.myklebust@primarydata.com>
Wed, 17 Feb 2016 16:35:25 +0000 (11:35 -0500)
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-...")
Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
fs/nfs/nfs4proc.c

index 4bfc33a..1488159 100644 (file)
@@ -2466,9 +2466,9 @@ 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(d_inode(opendata->dir)));