[PATCH] taskstats_tgid_free: fix usage

taskstats_tgid_free() is called on copy_process's error path. This is wrong.

	IF (clone_flags & CLONE_THREAD)
		We should not clear ->signal->taskstats, current uses it,
		it probably has a valid accumulated info.
	ELSE
		taskstats_tgid_init() set ->signal->taskstats = NULL,
		there is nothing to free.

Move the callsite to __exit_signal(). We don't need any locking, entire
thread group is exiting, nobody should have a reference to soon to be
released ->signal.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Jay Lan <jlan@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 3 insertions, 12 deletions

diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index 16894b7edcc8..a437ca0d226b 100644
--- a/include/linux/taskstats_kern.h
+++ b/include/linux/taskstats_kern.h
@@ -49,17 +49,8 @@ static inline void taskstats_tgid_alloc(struct signal_struct *sig)
 
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {
-        struct taskstats *stats = NULL;
-        unsigned long flags;
-
-        spin_lock_irqsave(&sig->stats_lock, flags);
-        if (sig->stats) {
-                stats = sig->stats;
-                sig->stats = NULL;
-        }
-        spin_unlock_irqrestore(&sig->stats_lock, flags);
-        if (stats)
-                kmem_cache_free(taskstats_cache, stats);
+        if (sig->stats)
+                kmem_cache_free(taskstats_cache, sig->stats);
 }
 
 extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
diff --git a/kernel/exit.c b/kernel/exit.c
index f250a5e3e281..06de6c4e8ca3 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -128,6 +128,7 @@ static void __exit_signal(struct task_struct *tsk)
         flush_sigqueue(&tsk->pending);
         if (sig) {
                 flush_sigqueue(&sig->shared_pending);
+                taskstats_tgid_free(sig);
                 __cleanup_signal(sig);
         }
 }
diff --git a/kernel/fork.c b/kernel/fork.c
index 29ebb30850ed..213326609bac 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -897,7 +897,6 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
 void __cleanup_signal(struct signal_struct *sig)
 {
         exit_thread_group_keys(sig);
-        taskstats_tgid_free(sig);
         kmem_cache_free(signal_cachep, sig);
 }