From d2a5ee1a6492666ba1c9300173107c65a9139ca6 Mon Sep 17 00:00:00 2001
From: Binyi Han <dantengknight@gmail.com>
Date: Sun, 4 Sep 2022 00:46:47 -0700
Subject: [PATCH] mm: fix dereferencing possible ERR_PTR

commit 4eb5bbde3ccb710d3b85bfb13466612e56393369 upstream.

Smatch checker complains that 'secretmem_mnt' dereferencing possible
ERR_PTR().  Let the function return if 'secretmem_mnt' is ERR_PTR, to
avoid deferencing it.

Link: https://lkml.kernel.org/r/20220904074647.GA64291@cloud-MacBookPro
Fixes: 1507f51255c9f ("mm: introduce memfd_secret system call to create "secret" memory areas")
Signed-off-by: Binyi Han <dantengknight@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foudation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Cc: Hagen Paul Pfeifer <hagen@jauu.net>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/secretmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/secretmem.c b/mm/secretmem.c
index 14f49c0aa66e..d1986ce2e7c7 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -283,7 +283,7 @@ static int secretmem_init(void)
 
 	secretmem_mnt = kern_mount(&secretmem_fs);
 	if (IS_ERR(secretmem_mnt))
-		ret = PTR_ERR(secretmem_mnt);
+		return PTR_ERR(secretmem_mnt);
 
 	/* prevent secretmem mappings from ever getting PROT_EXEC */
 	secretmem_mnt->mnt_flags |= MNT_NOEXEC;