9p: Fix possible inode leak in v9fs_get_inode.

Add a missing iput when cleaning up if v9fs_get_inode
fails after returning a valid inode.
Signed-off-by: NAbhishek Kulkarni <adkulkar@umail.iu.edu>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

fs/9p/vfs_inode.c

@@ -207,13 +207,18 @@ v9fs_blank_wstat(struct p9_wstat *wstat)
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 {
+	int err;
 	struct inode *inode;
 	struct v9fs_session_info *v9ses = sb->s_fs_info;
 
 	P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
 
 	inode = new_inode(sb);
-	if (inode) {
+	if (!inode) {
+		P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
+		return -ENOMEM;
+	}
+
 	inode->i_mode = mode;
 	inode->i_uid = current_fsuid();
 	inode->i_gid = current_fsgid();
@@ -230,10 +235,10 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 		if (!v9fs_extended(v9ses)) {
 			P9_DPRINTK(P9_DEBUG_ERROR,
 				   "special files without extended mode\n");
-				return ERR_PTR(-EINVAL);
+			err = -EINVAL;
+			goto error;
 		}
-			init_special_inode(inode, inode->i_mode,
-					   inode->i_rdev);
+		init_special_inode(inode, inode->i_mode, inode->i_rdev);
 		break;
 	case S_IFREG:
 		inode->i_op = &v9fs_file_inode_operations;
@@ -243,7 +248,8 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 		if (!v9fs_extended(v9ses)) {
 			P9_DPRINTK(P9_DEBUG_ERROR,
 				   "extended modes used w/o 9P2000.u\n");
-				return ERR_PTR(-EINVAL);
+			err = -EINVAL;
+			goto error;
 		}
 		inode->i_op = &v9fs_symlink_inode_operations;
 		break;
@@ -256,16 +262,17 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
 		inode->i_fop = &v9fs_dir_operations;
 		break;
 	default:
-			P9_DPRINTK(P9_DEBUG_ERROR,
-				"BAD mode 0x%x S_IFMT 0x%x\n",
+		P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
 			   mode, mode & S_IFMT);
-			return ERR_PTR(-EINVAL);
-		}
-	} else {
-		P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
-		return ERR_PTR(-ENOMEM);
+		err = -EINVAL;
+		goto error;
 	}
+
 	return inode;
+
+error:
+	iput(inode);
+	return ERR_PTR(err);
 }
 
 /*