This is a note to let you know that I've just added the patch titled NFSD: fix dest to src mount in inter-server COPY to the 5.11-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: nfsd-fix-dest-to-src-mount-in-inter-server-copy.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 614c9750173e412663728215152cc6d12bcb3425 Mon Sep 17 00:00:00 2001 From: Olga Kornievskaia <kolga@xxxxxxxxxx> Date: Tue, 9 Mar 2021 09:41:14 -0500 Subject: NFSD: fix dest to src mount in inter-server COPY From: Olga Kornievskaia <kolga@xxxxxxxxxx> commit 614c9750173e412663728215152cc6d12bcb3425 upstream. A cleanup of the inter SSC copy needs to call fput() of the source file handle to make sure that file structure is freed as well as drop the reference on the superblock to unmount the source server. Fixes: 36e1e5ba90fb ("NFSD: Fix use-after-free warning when doing inter-server copy") Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> Tested-by: Dai Ngo <dai.ngo@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/nfsd/nfs4proc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1304,7 +1304,7 @@ nfsd4_cleanup_inter_ssc(struct vfsmount struct nfsd_file *dst) { nfs42_ssc_close(src->nf_file); - /* 'src' is freed by nfsd4_do_async_copy */ + fput(src->nf_file); nfsd_file_put(dst); mntput(ss_mnt); } Patches currently in stable-queue which might be from kolga@xxxxxxxxxx are queue-5.11/nfsd-fix-dest-to-src-mount-in-inter-server-copy.patch