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Subject: [PATCH] NFSD: Fix nfsd4_encode_fattr4() crasher
From: Chuck Lever <cel@kernel.org>
To: linux-nfs@vger.kernel.org
Cc: Scott Mayhew <smayhew@redhat.com>, Chuck Lever <chuck.lever@oracle.com>
Date: Thu, 25 Apr 2024 17:46:26 -0400
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From: Chuck Lever <chuck.lever@oracle.com>

Ensure that args.acl is initialized early. It is used in an
unconditional call to kfree() on the way out of
nfsd4_encode_fattr4().

Reported-by: Scott Mayhew <smayhew@redhat.com>
Fixes: 83ab8678ad0c ("NFSD: Add struct nfsd4_fattr_args")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 85d43b3249f9..ea76100e50ca 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3544,6 +3544,7 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 	args.exp = exp;
 	args.dentry = dentry;
 	args.ignore_crossmnt = (ignore_crossmnt != 0);
+	args.acl = NULL;
 
 	/*
 	 * Make a local copy of the attribute bitmap that can be modified.
@@ -3602,7 +3603,6 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 	} else
 		args.fhp = fhp;
 
-	args.acl = NULL;
 	if (attrmask[0] & FATTR4_WORD0_ACL) {
 		err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
 		if (err == -EOPNOTSUPP)