sysrq: Fix possible race with exiting task

[karo-tx-linux.git] / drivers / tty / sysrq.c

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 7867b7c4538e1cb02b7b4192f53f2f6783bed104..a1bcad7ef739a8a934bd1750dd424a5a971f495a 100644 (file)
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -322,11 +322,13 @@ static void send_sig_all(int sig)
 {
        struct task_struct *p;
 
+       read_lock(&tasklist_lock);
        for_each_process(p) {
                if (p->mm && !is_global_init(p))
                        /* Not swapper, init nor kernel thread */
                        force_sig(sig, p);
        }
+       read_unlock(&tasklist_lock);
 }
 
 static void sysrq_handle_term(int key)