From b26ebfe12f34f372cf041c6f801fa49c3fb382c5 Mon Sep 17 00:00:00 2001 From: Corey Minyard Date: Fri, 6 Mar 2020 11:23:14 -0600 Subject: [PATCH] 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: 49cb2fc42ce4 ("fork: extend clone3() to support setting a PID") Signed-off-by: Corey Minyard Acked-by: Christian Brauner Cc: Andrei Vagin Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Oleg Nesterov Cc: Adrian Reber Cc: # 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 --- kernel/pid.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/pid.c b/kernel/pid.c index 0f4ecb5..19645b2 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; -- 2.7.4