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authorOleg Nesterov <oleg@tv-sign.ru>2006-10-28 10:38:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-28 11:30:54 -0700
commit093a8e8aecd77b2799934996a55a6838e1e2b8f3 (patch)
treeece87b2e194494059b2d4aaa43a094786dac1db7
parent05d5bcd60e8202e5c7b28cf61186043a4d612623 (diff)
downloadlinux-093a8e8aecd77b2799934996a55a6838e1e2b8f3.tar.gz
[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>
-rw-r--r--include/linux/taskstats_kern.h13
-rw-r--r--kernel/exit.c1
-rw-r--r--kernel/fork.c1
3 files changed, 3 insertions, 12 deletions
diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index 16894b7edcc..a437ca0d226 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 f250a5e3e28..06de6c4e8ca 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 29ebb30850e..213326609ba 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);
}