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fs/9p: Add fid before dentry instantiation

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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>
This commit is contained in:
Aneesh Kumar K.V
2011-07-25 18:06:32 +00:00
committed by Eric Van Hensbergen
parent ddf28352b8
commit 5441ae5eb3
2 changed files with 5 additions and 7 deletions
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4
fs/9p/vfs_inode.c
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@@ -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);