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authorNeil Horman <nhorman@tuxdriver.com>2010-10-05 03:39:21 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-05 20:06:01 -0700
commit27e6f065df132b5270014d3285889b15185e9da9 (patch)
treeb529f186972ab0577e96e4234803d795f143a2bd /drivers/net
parent392bd0cb000d4aac9e88e4f50823db85e7220688 (diff)
bonding: fix WARN_ON when writing to bond_master sysfs file
Fix a WARN_ON failure in bond_masters sysfs file Got a report of this warning recently bonding: bond0 is being created... ------------[ cut here ]------------ WARNING: at fs/proc/generic.c:590 proc_register+0x14d/0x185() Hardware name: ProLiant BL465c G1 proc_dir_entry 'bonding/bond0' already registered Modules linked in: bonding ipv6 tg3 bnx2 shpchp amd64_edac_mod edac_core ipmi_si ipmi_msghandler serio_raw i2c_piix4 k8temp edac_mce_amd hpwdt microcode hpsa cc iss radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: scsi_wai t_scan] Pid: 935, comm: ifup-eth Not tainted 2.6.33.5-124.fc13.x86_64 #1 Call Trace: [<ffffffff8104b54c>] warn_slowpath_common+0x77/0x8f [<ffffffff8104b5b1>] warn_slowpath_fmt+0x3c/0x3e [<ffffffff8114bf0b>] proc_register+0x14d/0x185 [<ffffffff8114c20c>] proc_create_data+0x87/0xa1 [<ffffffffa0211e9b>] bond_create_proc_entry+0x55/0x95 [bonding] [<ffffffffa0215e5d>] bond_init+0x95/0xd0 [bonding] [<ffffffff8138cd97>] register_netdevice+0xdd/0x29e [<ffffffffa021240b>] bond_create+0x8e/0xb8 [bonding] [<ffffffffa021c4be>] bonding_store_bonds+0xb3/0x1c1 [bonding] [<ffffffff812aec85>] class_attr_store+0x27/0x29 [<ffffffff8115423d>] sysfs_write_file+0x10f/0x14b [<ffffffff81101acf>] vfs_write+0xa9/0x106 [<ffffffff81101be2>] sys_write+0x45/0x69 [<ffffffff81009b02>] system_call_fastpath+0x16/0x1b ---[ end trace a677c3f7f8b16b1e ]--- bonding: Bond creation failed. It happens because a user space writer to bond_master can try to register an already existing bond interface name. Fix it by teaching bond_create to check for the existance of devices with that name first in cases where a non-NULL name parameter has been passed in Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3b16f62d560..e953c6ad6e6 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -5164,6 +5164,15 @@ int bond_create(struct net *net, const char *name)
res = dev_alloc_name(bond_dev, "bond%d");
if (res < 0)
goto out;
+ } else {
+ /*
+ * If we're given a name to register
+ * we need to ensure that its not already
+ * registered
+ */
+ res = -EEXIST;
+ if (__dev_get_by_name(net, name) != NULL)
+ goto out;
}
res = register_netdevice(bond_dev);