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authorSalman Qazi <sqazi@google.com>2012-06-26 05:18:15 +0400
committerIngo Molnar <mingo@kernel.org>2012-07-05 22:57:32 +0400
commit164c33c6adee609b8b9062cce4c10f764d0dce13 (patch)
tree47ff40e1ae3d8206dd900e64d757ce16a3ee0774 /kernel/fork.c
parent9e85a6f9dc231f3ed3c1dc1b12217505d970142a (diff)
downloadlinux-164c33c6adee609b8b9062cce4c10f764d0dce13.tar.xz
sched: Fix fork() error path to not crash
In dup_task_struct(), if arch_dup_task_struct() fails, the clean up code fails to clean up correctly. That's because the clean up code depends on unininitalized ti->task pointer. We fix this by making sure that the task and thread_info know about each other before we attempt to take the error path. Signed-off-by: Salman Qazi <sqazi@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20120626011815.11323.5533.stgit@dungbeetle.mtv.corp.google.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index ab5211b9e622..f00e319d8376 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -304,12 +304,17 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
}
err = arch_dup_task_struct(tsk, orig);
- if (err)
- goto out;
+ /*
+ * We defer looking at err, because we will need this setup
+ * for the clean up path to work correctly.
+ */
tsk->stack = ti;
-
setup_thread_stack(tsk, orig);
+
+ if (err)
+ goto out;
+
clear_user_return_notifier(tsk);
clear_tsk_need_resched(tsk);
stackend = end_of_stack(tsk);