From: Eduardo Blanco Date: Tue, 19 Oct 2010 09:26:47 +0000 (+0100) Subject: Fixed race condition at ip_vs.ko module init. X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d86bef73b4a24e59e7c1f896a72bbf38430ac2c6;p=deliverable%2Flinux.git 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 Signed-off-by: Simon Horman --- diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index a697591d0e23..0b884d3e192f 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -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 */