The patch titled Subject: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs has been added to the -mm mm-unstable branch. Its filename is shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Roberto Sassu roberto.sassu@huawei.com Subject: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs Date: Wed, 7 Jun 2023 18:15:23 +0200

As the ramfs-based tmpfs uses ramfs_init_fs_context() for the init_fs_context method, which allocates fc->s_fs_info, use ramfs_kill_sb() to free it and avoid a memory leak.

Link: https://lkml.kernel.org/r/20230607161523.2876433-1-roberto.sassu@huaweicloud... Fixes: f32356261d44 ("vfs: Convert ramfs, shmem, tmpfs, devtmpfs, rootfs to use the new mount API") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com Cc: Hugh Dickins hughd@google.com Cc: David Howells dhowells@redhat.com Cc: Al Viro viro@zeniv.linux.org.uk Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/ramfs/inode.c | 2 +- include/linux/ramfs.h | 1 + mm/shmem.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ramfs/inode.c~shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs +++ a/fs/ramfs/inode.c @@ -278,7 +278,7 @@ int ramfs_init_fs_context(struct fs_cont return 0; }

-static void ramfs_kill_sb(struct super_block *sb) +void ramfs_kill_sb(struct super_block *sb) { kfree(sb->s_fs_info); kill_litter_super(sb); --- a/include/linux/ramfs.h~shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs +++ a/include/linux/ramfs.h @@ -7,6 +7,7 @@ struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir, umode_t mode, dev_t dev); extern int ramfs_init_fs_context(struct fs_context *fc); +extern void ramfs_kill_sb(struct super_block *sb);

#ifdef CONFIG_MMU static inline int --- a/mm/shmem.c~shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs +++ a/mm/shmem.c @@ -4214,7 +4214,7 @@ static struct file_system_type shmem_fs_ .name = "tmpfs", .init_fs_context = ramfs_init_fs_context, .parameters = ramfs_fs_parameters, - .kill_sb = kill_litter_super, + .kill_sb = ramfs_kill_sb, .fs_flags = FS_USERNS_MOUNT, };

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

memfd-check-for-non-null-file_seals-in-memfd_create-syscall.patch shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs.patch