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Fixed race condition at ip_vs.ko module init. 

Lists were initialized after the module was registered.  Multiple ipvsadm
processes at module load triggered a race condition that resulted in a null
pointer dereference in do_ip_vs_get_ctl(). As a result, __ip_vs_mutex
was left locked preventing all further ipvsadm commands.

Signed-off-by: Eduardo J. Blanco <ejblanco@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
This commit is contained in:
Eduardo Blanco 2010-10-19 10:26:47 +01:00 committed by Simon Horman
parent 714f095f74
commit d86bef73b4
1 changed files with 10 additions and 9 deletions
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19
net/netfilter/ipvs/ip_vs_ctl.c
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@ -3400,6 +3400,16 @@ int __init ip_vs_control_init(void)
EnterFunction(2);
/* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
}
for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) {
INIT_LIST_HEAD(&ip_vs_rtable[idx]);
}
smp_wmb();
ret = nf_register_sockopt(&ip_vs_sockopts);
if (ret) {
pr_err("cannot register sockopt.\n");
@ -3418,15 +3428,6 @@ int __init ip_vs_control_init(void)
sysctl_header = register_sysctl_paths(net_vs_ctl_path, vs_vars);
/* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
}
for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) {
INIT_LIST_HEAD(&ip_vs_rtable[idx]);
}
ip_vs_new_estimator(&ip_vs_stats);
/* Hook the defense timer */