Patch "NFS: Fix potential oops in nfs_inode_remove_request()" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    NFS: Fix potential oops in nfs_inode_remove_request()

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs-fix-potential-oops-in-nfs_inode_remove_request.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 6a6d4644ce935ddec4f76223ac0ca68da56bd2d3 Mon Sep 17 00:00:00 2001
From: Scott Mayhew <smayhew@xxxxxxxxxx>
Date: Wed, 11 Oct 2023 10:43:26 -0400
Subject: NFS: Fix potential oops in nfs_inode_remove_request()

From: Scott Mayhew <smayhew@xxxxxxxxxx>

commit 6a6d4644ce935ddec4f76223ac0ca68da56bd2d3 upstream.

Once a folio's private data has been cleared, it's possible for another
process to clear the folio->mapping (e.g. via invalidate_complete_folio2
or evict_mapping_folio), so it wouldn't be safe to call
nfs_page_to_inode() after that.

Fixes: 0c493b5cf16e ("NFS: Convert buffered writes to use folios")
Signed-off-by: Scott Mayhew <smayhew@xxxxxxxxxx>
Reviewed-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
Tested-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nfs/write.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 7720b5e43014..9d82d50ce0b1 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -788,6 +788,8 @@ static void nfs_inode_add_request(struct nfs_page *req)
  */
 static void nfs_inode_remove_request(struct nfs_page *req)
 {
+	struct nfs_inode *nfsi = NFS_I(nfs_page_to_inode(req));
+
 	if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
 		struct folio *folio = nfs_page_to_folio(req->wb_head);
 		struct address_space *mapping = folio_file_mapping(folio);
@@ -802,7 +804,7 @@ static void nfs_inode_remove_request(struct nfs_page *req)
 	}
 
 	if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) {
-		atomic_long_dec(&NFS_I(nfs_page_to_inode(req))->nrequests);
+		atomic_long_dec(&nfsi->nrequests);
 		nfs_release_request(req);
 	}
 }
-- 
2.42.0



Patches currently in stable-queue which might be from smayhew@xxxxxxxxxx are

queue-6.5/nfs-fix-potential-oops-in-nfs_inode_remove_request.patch



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