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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-07-25 22:06:32 +0400
committerEric Van Hensbergen <ericvh@gmail.com>2011-09-06 17:17:14 +0400
commit5441ae5eb3614d3c28f77073370738a2820c88e4 (patch)
treeeb61016b762edb343051e5724527eb1484555085 /fs/9p
parentddf28352b80c86754a6424e3a61e8bdf9213b3c7 (diff)
downloadlinux-5441ae5eb3614d3c28f77073370738a2820c88e4.tar.xz
fs/9p: Add fid before dentry instantiation
d_instantiate marks the dentry positive. So a parallel lookup and mkdir of the directory can find dentry that doesn't have fid attached. This can result in both the code path doing v9fs_fid_add which results in v9fs_dentry leak. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/vfs_inode.c4
-rw-r--r--fs/9p/vfs_inode_dotl.c8
2 files changed, 5 insertions, 7 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 8bb5507e822f..43dd540663af 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -645,13 +645,11 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
goto error;
}
- d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
-
+ d_instantiate(dentry, inode);
return ofid;
-
error:
if (ofid)
p9_client_clunk(ofid);
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index b6c8ed205192..0ca224c8bb60 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -281,10 +281,10 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
goto error;
}
- d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
+ d_instantiate(dentry, inode);
/* Now set the ACL based on the default value */
v9fs_set_create_acl(dentry, &dacl, &pacl);
@@ -403,10 +403,10 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir,
err);
goto error;
}
- d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
+ d_instantiate(dentry, inode);
fid = NULL;
} else {
/*
@@ -657,10 +657,10 @@ v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
err);
goto error;
}
- d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
+ d_instantiate(dentry, inode);
fid = NULL;
} else {
/* Not in cached mode. No need to populate inode with stat */
@@ -810,10 +810,10 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
err);
goto error;
}
- d_instantiate(dentry, inode);
err = v9fs_fid_add(dentry, fid);
if (err < 0)
goto error;
+ d_instantiate(dentry, inode);
fid = NULL;
} else {
/*