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authorAllan Stephens <allan.stephens@windriver.com>2011-05-27 21:59:17 +0400
committerPaul Gortmaker <paul.gortmaker@windriver.com>2011-09-18 06:55:05 +0400
commitbcd326e844c46e0533a79f91e75dea160469cf86 (patch)
treec1c6172089ca0ceb98625eb8ffb4f79979f91ce2 /net/tipc/eth_media.c
parentb4b5610223f17790419b03eaa962b0e3ecf930d7 (diff)
downloadlinux-bcd326e844c46e0533a79f91e75dea160469cf86.tar.xz
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>
Diffstat (limited to 'net/tipc/eth_media.c')
-rw-r--r--net/tipc/eth_media.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index b69092eb95d8..69bedd8a297b 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -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);
}