Patch "nfsd: only fill out return pointer on success in nfsd4_lookup_stateid" has been added to the 5.10-stable tree

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

    nfsd: only fill out return pointer on success in nfsd4_lookup_stateid

to the 5.10-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-only-fill-out-return-pointer-on-success-in-nfsd.patch
and it can be found in the queue-5.10 subdirectory.

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



commit 26f9d1a23612c576fd8d975a24fecf31d08819a6
Author: Jeff Layton <jlayton@xxxxxxxxxx>
Date:   Mon Sep 26 12:38:44 2022 -0400

    nfsd: only fill out return pointer on success in nfsd4_lookup_stateid
    
    [ Upstream commit 4d01416ab41540bb13ec4a39ac4e6c4aa5934bc9 ]
    
    In the case of a revoked delegation, we still fill out the pointer even
    when returning an error, which is bad form. Only overwrite the pointer
    on success.
    
    Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
    Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index f207c73ae1b58..1dc3823f3d124 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -6289,6 +6289,7 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
 		     struct nfs4_stid **s, struct nfsd_net *nn)
 {
 	__be32 status;
+	struct nfs4_stid *stid;
 	bool return_revoked = false;
 
 	/*
@@ -6311,15 +6312,16 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
 	}
 	if (status)
 		return status;
-	*s = find_stateid_by_type(cstate->clp, stateid, typemask);
-	if (!*s)
+	stid = find_stateid_by_type(cstate->clp, stateid, typemask);
+	if (!stid)
 		return nfserr_bad_stateid;
-	if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
-		nfs4_put_stid(*s);
+	if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
+		nfs4_put_stid(stid);
 		if (cstate->minorversion)
 			return nfserr_deleg_revoked;
 		return nfserr_bad_stateid;
 	}
+	*s = stid;
 	return nfs_ok;
 }
 




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