linux-kernel - [PATCH 5.5 110/151] pid: Fix error return value in some cases

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Date:   Tue, 17 Mar 2020 11:55:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Corey Minyard <cminyard@...sta.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Adrian Reber <areber@...hat.com>
Subject: [PATCH 5.5 110/151] pid: Fix error return value in some cases

From: Corey Minyard <cminyard@...sta.com>

commit b26ebfe12f34f372cf041c6f801fa49c3fb382c5 upstream.

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@...sta.com>
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Cc: Andrei Vagin <avagin@...il.com>
Cc: Dmitry Safonov <0x7f454c46@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Adrian Reber <areber@...hat.com>
Cc: <stable@...r.kernel.org> # 5.5
Link: https://lore.kernel.org/r/20200306172314.12232-1-minyard@acm.org
[christian.brauner@...ntu.com: fixup commit message]
Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/pid.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -247,6 +247,8 @@ struct pid *alloc_pid(struct pid_namespa
 		tmp = tmp->parent;
 	}
 
+	retval = -ENOMEM;
+
 	if (unlikely(is_child_reaper(pid))) {
 		if (pid_ns_prepare_proc(ns))
 			goto out_free;