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| author | Allan Stephens <allan.stephens@windriver.com> | 2008-05-21 14:52:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-05-21 14:52:30 -0700 |
| commit | 59f0c4523fdea865fab7d69d878269992a9d08dd (patch) | |
| tree | 4516d63a1c32fb8e06d0730527f3c54c02df2f87 /net/tipc/netlink.c | |
| parent | dc58c78c047fb01f4c13e7de91abc5eb931920b3 (diff) | |
| download | linux-59f0c4523fdea865fab7d69d878269992a9d08dd.tar.gz linux-59f0c4523fdea865fab7d69d878269992a9d08dd.tar.bz2 linux-59f0c4523fdea865fab7d69d878269992a9d08dd.zip | |
tipc: Fix skb_under_panic when configuring TIPC without privileges
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>
Diffstat (limited to 'net/tipc/netlink.c')
| -rw-r--r-- | net/tipc/netlink.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c index 6a7f7b4c2595..c387217bb230 100644 --- a/net/tipc/netlink.c +++ b/net/tipc/netlink.c @@ -2,7 +2,7 @@ * net/tipc/netlink.c: TIPC configuration handling * * Copyright (c) 2005-2006, 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 @@ -45,15 +45,17 @@ static int handle_cmd(struct sk_buff *skb, struct genl_info *info) struct nlmsghdr *req_nlh = info->nlhdr; struct tipc_genlmsghdr *req_userhdr = info->userhdr; int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN); + u16 cmd; if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN))) - rep_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN); + cmd = TIPC_CMD_NOT_NET_ADMIN; else - rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, - req_userhdr->cmd, - NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, - NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), - hdr_space); + cmd = req_userhdr->cmd; + + rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd, + NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, + NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), + hdr_space); if (rep_buf) { skb_push(rep_buf, hdr_space); |