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pid: Fix error return value in some cases 

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: 49cb2fc42c ("fork: extend clone3() to support setting a PID")
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Andrei Vagin <avagin@gmail.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Adrian Reber <areber@redhat.com>
Cc: <stable@vger.kernel.org> # 5.5
Link: https://lore.kernel.org/r/20200306172314.12232-1-minyard@acm.org
[christian.brauner@ubuntu.com: fixup commit message]
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Corey Minyard 2020-03-06 11:23:14 -06:00 committed by Christian Brauner
parent 98d54f81e3
commit b26ebfe12f
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1 changed files with 2 additions and 0 deletions
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kernel/pid.c
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@ -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;