* Maninder Singh <maninder...@samsung.com> wrote:
> EP-F6AA0618C49C4AEDA73BFF1B39950BAB
> Hi,
>
> From: Maninder Singh <maninder...@samsung.com>
>
> Subject: [PATCH 1/1] kernel/exit.c : Fix missing task_unlock
>
> This patch adds missing read_unlock if do_wait_thread or ptrace_do_wait
> returns non zero.
>
> Signed-off-by: Maninder Singh <maninder...@samsung.com>
> Signed-off-by: Vaneet Narang <v.nar...@samsung.com>
> Reviewd-by: Akhilesh Kumar <akhiles...@samsung.com>
> ---
> kernel/exit.c | 8 ++++++--
> 1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/exit.c b/kernel/exit.c
> index 22fcc05..31a061f 100644
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -1486,12 +1486,16 @@ repeat:
> tsk = current;
> do {
> retval = do_wait_thread(wo, tsk);
> - if (retval)
> + if (retval) {
> + read_unlock(&tasklist_lock);
> goto end;
> + }
>
> retval = ptrace_do_wait(wo, tsk);
> - if (retval)
> + if (retval) {
> + read_unlock(&tasklist_lock);
> goto end;
> + }
>
> if (wo->wo_flags & __WNOTHREAD)
> break;
That's surprising and the changelog is lacking.
So the last time that code was touched upstream was 7 years ago:
commit 64a16caf5e3417ee32f670debcb5857b02a9e08e
Author: Oleg Nesterov <o...@redhat.com>
Date: Wed Jun 17 16:27:40 2009 -0700
do_wait: simplify retval/tsk_result/notask_error mess
please explain whether what you fix is:
1) an ancient bug that somehow nobody ever triggered (plus analysis
of why it wasn't triggered)
2) a new bug introduced by commit XYZ (plus analysis)
3) something else
Thanks,
Ingo
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