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![]() The existing cleanup routine implementation is not well synchronized with the syscall routine. When a device is detaching, below race could occur. static int ax25_sendmsg(...) { ... lock_sock() ax25 = sk_to_ax25(sk); if (ax25->ax25_dev == NULL) // CHECK ... ax25_queue_xmit(skb, ax25->ax25_dev->dev); // USE ... } static void ax25_kill_by_device(...) { ... if (s->ax25_dev == ax25_dev) { s->ax25_dev = NULL; ... } Other syscall functions like ax25_getsockopt, ax25_getname, ax25_info_show also suffer from similar races. To fix them, this patch introduce lock_sock() into ax25_kill_by_device in order to guarantee that the nullify action in cleanup routine cannot proceed when another socket request is pending. Signed-off-by: Hanjie Wu <nagi@zju.edu.cn> Signed-off-by: Lin Ma <linma@zju.edu.cn> Signed-off-by: David S. Miller <davem@davemloft.net> |
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.. | ||
af_ax25.c | ||
ax25_addr.c | ||
ax25_dev.c | ||
ax25_ds_in.c | ||
ax25_ds_subr.c | ||
ax25_ds_timer.c | ||
ax25_iface.c | ||
ax25_in.c | ||
ax25_ip.c | ||
ax25_out.c | ||
ax25_route.c | ||
ax25_std_in.c | ||
ax25_std_subr.c | ||
ax25_std_timer.c | ||
ax25_subr.c | ||
ax25_timer.c | ||
ax25_uid.c | ||
Kconfig | ||
Makefile | ||
sysctl_net_ax25.c |