[merged mm-hotfixes-stable] memfd-check-for-non-null-file_seals-in-memfd_create-syscall.patch removed from -mm tree

[merged mm-hotfixes-stable] memfd-check-for-non-null-file_seals-in-memfd_create-syscall.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: memfd: check for non-NULL file_seals in memfd_create() syscall
has been removed from the -mm tree.  Its filename was
     memfd-check-for-non-null-file_seals-in-memfd_create-syscall.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Roberto Sassu <roberto.sassu@huawei.com>
Subject: memfd: check for non-NULL file_seals in memfd_create() syscall
Date: Wed, 7 Jun 2023 15:24:27 +0200

Ensure that file_seals is non-NULL before using it in the memfd_create()
syscall.  One situation in which memfd_file_seals_ptr() could return a
NULL pointer when CONFIG_SHMEM=n, oopsing the kernel.

Link: https://lkml.kernel.org/r/20230607132427.2867435-1-roberto.sassu@huaweicloud.com
Fixes: 47b9012ecdc7 ("shmem: add sealing support to hugetlb-backed memfd")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: Marc-Andr Lureau <marcandre.lureau@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memfd.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/mm/memfd.c~memfd-check-for-non-null-file_seals-in-memfd_create-syscall
+++ a/mm/memfd.c
@@ -371,12 +371,15 @@ SYSCALL_DEFINE2(memfd_create,
 
 		inode->i_mode &= ~0111;
 		file_seals = memfd_file_seals_ptr(file);
-		*file_seals &= ~F_SEAL_SEAL;
-		*file_seals |= F_SEAL_EXEC;
+		if (file_seals) {
+			*file_seals &= ~F_SEAL_SEAL;
+			*file_seals |= F_SEAL_EXEC;
+		}
 	} else if (flags & MFD_ALLOW_SEALING) {
 		/* MFD_EXEC and MFD_ALLOW_SEALING are set */
 		file_seals = memfd_file_seals_ptr(file);
-		*file_seals &= ~F_SEAL_SEAL;
+		if (file_seals)
+			*file_seals &= ~F_SEAL_SEAL;
 	}
 
 	fd_install(fd, file);
_

Patches currently in -mm which might be from roberto.sassu@huawei.com are

shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs.patch