From: Oleg Nesterov When non-leader thread does exec, de_thread calls release_task(leader) before calling exit_itimers(). If local timer interrupt happens in between, it can oops in send_group_sigqueue() while taking ->sighand->siglock == NULL. However, we can't change send_group_sigqueue() to check p->signal != NULL, because sys_timer_create() does get_task_struct() only in SIGEV_THREAD_ID case. So it is possible that this task_struct was already freed and we can't trust p->signal. This patch changes de_thread() so that leader released after exit_itimers() call. Signed-off-by: Oleg Nesterov Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman --- fs/exec.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- linux-2.6.14.1.orig/fs/exec.c +++ linux-2.6.14.1/fs/exec.c @@ -593,6 +593,7 @@ static inline int de_thread(struct task_ struct signal_struct *sig = tsk->signal; struct sighand_struct *newsighand, *oldsighand = tsk->sighand; spinlock_t *lock = &oldsighand->siglock; + struct task_struct *leader = NULL; int count; /* @@ -668,7 +669,7 @@ static inline int de_thread(struct task_ * and to assume its PID: */ if (!thread_group_leader(current)) { - struct task_struct *leader = current->group_leader, *parent; + struct task_struct *parent; struct dentry *proc_dentry1, *proc_dentry2; unsigned long exit_state, ptrace; @@ -677,6 +678,7 @@ static inline int de_thread(struct task_ * It should already be zombie at this point, most * of the time. */ + leader = current->group_leader; while (leader->exit_state != EXIT_ZOMBIE) yield(); @@ -736,7 +738,6 @@ static inline int de_thread(struct task_ proc_pid_flush(proc_dentry2); BUG_ON(exit_state != EXIT_ZOMBIE); - release_task(leader); } /* @@ -746,8 +747,11 @@ static inline int de_thread(struct task_ sig->flags = 0; no_thread_group: - BUG_ON(atomic_read(&sig->count) != 1); exit_itimers(sig); + if (leader) + release_task(leader); + + BUG_ON(atomic_read(&sig->count) != 1); if (atomic_read(&oldsighand->count) == 1) { /* --