Messages in this thread Patch in this message | | | From | minyard@acm ... | Subject | [PATCH v2] pid: Fix error return value in some cases | Date | Fri, 6 Mar 2020 11:23:14 -0600 |
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From: Corey Minyard <cminyard@mvista.com>
Recent changes to alloc_pid() allow the pid number to be specified on the command line. If set_tid_size is set, then the code scanning the levels will hard-set retval to -EPERM, overriding it's previous -ENOMEM value.
After the code scanning the levels, there are error returns that do not set retval, assuming it is still set to -ENOMEM.
So set retval back to -ENOMEM after scanning the levels.
Fixes: 49cb2fc42ce4 "fork: extend clone3() to support setting a PID" Signed-off-by: Corey Minyard <cminyard@mvista.com> Cc: <stable@vger.kernel.org> # 5.5 Cc: Adrian Reber <areber@redhat.com> Cc: Christian Brauner <christian.brauner@ubuntu.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Andrei Vagin <avagin@gmail.com> ---
Changes from v1: Just set retval to -ENOMEM before the gotos that would use it.
I do think that the second instance:
if (!(ns->pid_allocated & PIDNS_ADDING)) goto out_unlock;
is returning the wrong error value, but that's probably not a big deal, and if it was fixed would probably need to be a separate change.
In the first instance, the error return values are almost all -ENOMEM, anyway.
kernel/pid.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/pid.c b/kernel/pid.c index 0f4ecb57214c..19645b25b77c 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -247,6 +247,8 @@ struct pid *alloc_pid(struct pid_namespace *ns, pid_t *set_tid, tmp = tmp->parent; } + retval = -ENOMEM; + if (unlikely(is_child_reaper(pid))) { if (pid_ns_prepare_proc(ns)) goto out_free; -- 2.17.1
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