Merge tag 'v6.6-vfs.super.fixes.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull more superblock follow-on fixes from Christian Brauner:
 "This contains two more small follow-up fixes for the super work this
  cycle. I went through all filesystems once more and detected two minor
  issues that still needed fixing:

   - Some filesystems support mtd devices (e.g., mount -t jffs2 mtd2
     /mnt). The mtd infrastructure uses the sb->s_mtd pointer to find an
     existing superblock. When the mtd device is put and sb->s_mtd
     cleared the superblock can still be found fs_supers and so this
     risks a use-after-free.

     Add a small patch that aligns mtd with what we did for regular
     block devices and switch keying to rely on sb->s_dev.

     (This was tested with mtd devices and jffs2 as xfstests doesn't
     support mtd devices.)

   - Switch nfs back to rely on kill_anon_super() so the superblock is
     removed from the list of active supers before sb->s_fs_info is
     freed"

* tag 'v6.6-vfs.super.fixes.2' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  NFS: switch back to using kill_anon_super
  mtd: key superblock by device number
  fs: export sget_dev()

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index c8ff4156a0a1..4aeb3fa11927 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2397,6 +2397,7 @@ struct super_block *sget(struct file_system_type *type,
 			int (*test)(struct super_block *,void *),
 			int (*set)(struct super_block *,void *),
 			int flags, void *data);
+struct super_block *sget_dev(struct fs_context *fc, dev_t dev);
 
 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
 #define fops_get(fops) \