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tipc: Fix unsafe device list search when enabling bearer 

Ensures that the device list lock is held while trying to locate
the Ethernet device used by a newly enabled bearer, so that the
addition or removal of a device does not cause problems.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Allan Stephens 2011-05-27 13:59:17 -04:00 committed by Paul Gortmaker
parent b4b5610223
commit bcd326e844
1 changed files with 4 additions and 2 deletions
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6
net/tipc/eth_media.c
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@ -2,7 +2,7 @@
* net/tipc/eth_media.c: Ethernet bearer support for TIPC
*
* Copyright (c) 2001-2007, Ericsson AB
* Copyright (c) 2005-2007, Wind River Systems
* Copyright (c) 2005-2008, 2011, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -144,12 +144,15 @@ static int enable_bearer(struct tipc_bearer *tb_ptr)
/* Find device with specified name */
read_lock(&dev_base_lock);
for_each_netdev(&init_net, pdev) {
if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
dev = pdev;
dev_hold(dev);
break;
}
}
read_unlock(&dev_base_lock);
if (!dev)
return -ENODEV;
@ -166,7 +169,6 @@ static int enable_bearer(struct tipc_bearer *tb_ptr)
eb_ptr->tipc_packet_type.func = recv_msg;
eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
dev_hold(dev);
dev_add_pack(&eb_ptr->tipc_packet_type);
}