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-rw-r--r--kernel/taskstats.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 5d6a8c54ee85..9aeee511a463 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -237,14 +237,17 @@ static int fill_tgid(pid_t tgid, struct task_struct *tgidtsk,
} else
get_task_struct(first);
- /* Start with stats from dead tasks */
- spin_lock_irqsave(&first->signal->stats_lock, flags);
- if (first->signal->stats)
- memcpy(stats, first->signal->stats, sizeof(*stats));
- spin_unlock_irqrestore(&first->signal->stats_lock, flags);
tsk = first;
read_lock(&tasklist_lock);
+ /* Start with stats from dead tasks */
+ if (first->signal) {
+ spin_lock_irqsave(&first->signal->stats_lock, flags);
+ if (first->signal->stats)
+ memcpy(stats, first->signal->stats, sizeof(*stats));
+ spin_unlock_irqrestore(&first->signal->stats_lock, flags);
+ }
+
do {
if (tsk->exit_state == EXIT_ZOMBIE && thread_group_leader(tsk))
continue;
@@ -264,7 +267,7 @@ static int fill_tgid(pid_t tgid, struct task_struct *tgidtsk,
* Accounting subsytems can also add calls here to modify
* fields of taskstats.
*/
-
+ put_task_struct(first);
return 0;
}