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9p: if v9fs_fid_lookup() gets to asking server, it'd better have hashed dentry
... otherwise the path we'd built isn't worth much. Don't accept such fids obtained from paths unless dentry is still alived by the end of the work. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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parent
a3b2157e72
commit
5e608671df
1 changed files with 17 additions and 3 deletions
20
fs/9p/fid.c
20
fs/9p/fid.c
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@ -41,10 +41,15 @@
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*
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*/
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static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid)
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{
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hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata);
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}
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
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{
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spin_lock(&dentry->d_lock);
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hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata);
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__add_fid(dentry, fid);
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spin_unlock(&dentry->d_lock);
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}
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@ -198,8 +203,17 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
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}
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kfree(wnames);
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fid_out:
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if (!IS_ERR(fid))
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v9fs_fid_add(dentry, fid);
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if (!IS_ERR(fid)) {
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spin_lock(&dentry->d_lock);
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if (d_unhashed(dentry)) {
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spin_unlock(&dentry->d_lock);
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p9_client_clunk(fid);
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fid = ERR_PTR(-ENOENT);
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} else {
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__add_fid(dentry, fid);
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spin_unlock(&dentry->d_lock);
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}
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}
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err_out:
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up_read(&v9ses->rename_sem);
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return fid;
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