fs/9p, net/9p: memory leak fixes

Four memory leak fixes in the 9P code.
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

fs/9p/vfs_inode.c

@@ -1128,6 +1128,7 @@ v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb);
 		generic_fillattr(dentry->d_inode, stat);
 
+	p9stat_free(st);
 	kfree(st);
 	return 0;
 }
@@ -1489,6 +1490,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
 
 	retval = strnlen(buffer, buflen);
 done:
+	p9stat_free(st);
 	kfree(st);
 	return retval;
 }

net/9p/client.c

@@ -331,8 +331,10 @@ static void p9_tag_cleanup(struct p9_client *c)
 		}
 	}
 
-	if (c->tagpool)
+	if (c->tagpool) {
+		p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
 		p9_idpool_destroy(c->tagpool);
+	}
 
 	/* free requests associated with tags */
 	for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
@@ -944,6 +946,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 	int16_t nwqids, count;
 
 	err = 0;
+	wqids = NULL;
 	clnt = oldfid->clnt;
 	if (clone) {
 		fid = p9_fid_create(clnt);
@@ -994,9 +997,11 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 	else
 		fid->qid = oldfid->qid;
 
+	kfree(wqids);
 	return fid;
 
 clunk_fid:
+	kfree(wqids);
 	p9_client_clunk(fid);
 	fid = NULL;