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Subject[PATCH 5.5 110/151] pid: Fix error return value in some cases
From: Corey Minyard <>

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

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 <>
Cc: Oleg Nesterov <>
Cc: Adrian Reber <>
Cc: <> # 5.5
[ fixup commit message]
Signed-off-by: Christian Brauner <>
Signed-off-by: Greg Kroah-Hartman <>

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;

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