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tipc: Fix skb_under_panic when configuring TIPC without privileges

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This patch prevents a TIPC configuration command requiring network
administrator privileges from triggering an skbuff underrun if it
is issued by a process lacking those privileges.  The revised error
handling code avoids the use of a potentially uninitialized global
variable by transforming the unauthorized command into a new command,
then following the standard command processing path to generate the
required error message.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2008-05-21 14:52:30 -07:00 • committed by David S. Miller
parent dc58c78c04
commit 59f0c4523f
3 changed files with 23 additions and 9 deletions
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10
include/linux/tipc_config.h
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@ -2,7 +2,7 @@
* include/linux/tipc_config.h: Include file for TIPC configuration interface
*
* Copyright (c) 2003-2006, Ericsson AB
* Copyright (c) 2005, Wind River Systems
* Copyright (c) 2005-2007, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -135,6 +135,14 @@
#define TIPC_CMD_SET_MAX_SLAVES 0x800A /* tx unsigned, rx none */
#define TIPC_CMD_SET_NETID 0x800B /* tx unsigned, rx none */
/*
* Reserved commands:
* May not be issued by any process.
* Used internally by TIPC.
*/
#define TIPC_CMD_NOT_NET_ADMIN 0xC001 /* tx none, rx none */
/*
* TLV types defined for TIPC
*/