This is a note to let you know that I've just added the patch titled
nfsd: ensure that nfsd4_fattr_args.context is zeroed out
to the 6.10-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-ensure-that-nfsd4_fattr_args.context-is-zeroed-.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b71f66c0a6fbe9bf9d65131fda5e5c26282e476a
Author: Jeff Layton <jlayton@xxxxxxxxxx>
Date: Thu Aug 22 14:47:01 2024 -0400
nfsd: ensure that nfsd4_fattr_args.context is zeroed out
[ Upstream commit f58bab6fd4063913bd8321e99874b8239e9ba726 ]
If nfsd4_encode_fattr4 ends up doing a "goto out" before we get to
checking for the security label, then args.context will be set to
uninitialized junk on the stack, which we'll then try to free.
Initialize it early.
Fixes: f59388a579c6 ("NFSD: Add nfsd4_encode_fattr4_sec_label()")
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/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index c7bfd2180e3f2..8a7bc2b58e721 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3545,6 +3545,9 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
args.dentry = dentry;
args.ignore_crossmnt = (ignore_crossmnt != 0);
args.acl = NULL;
+#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
+ args.context = NULL;
+#endif
/*
* Make a local copy of the attribute bitmap that can be modified.
@@ -3617,7 +3620,6 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
args.contextsupport = false;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
- args.context = NULL;
if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
