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authorChuck Lever <chuck.lever@oracle.com>2014-11-08 20:15:18 -0500
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2014-11-25 16:22:16 -0500
commit6dd3436b9dc0df4b9ae7bb4e0076996a5ffda219 (patch)
treeb01d1040b665452f8036cee5dc45bccf09fbc04b /fs/nfs
parentedef1297f33a4546559d905457b435a5ea160bab (diff)
downloadlinux-6dd3436b9dc0df4b9ae7bb4e0076996a5ffda219.tar.bz2
NFS: SETCLIENTID XDR buffer sizes are incorrect
Use the correct calculation of the maximum size of a clientaddr4 when encoding and decoding SETCLIENTID operations. clientaddr4 is defined in section 2.2.10 of RFC3530bis-31. The usage in encode_setclientid_maxsz is missing the 4-byte length in both strings, but is otherwise correct. decode_setclientid_maxsz simply asks for a page of receive buffer space, which is unnecessarily large (more than 4KB). Note that a SETCLIENTID reply is either clientid+verifier, or clientaddr4, depending on the returned NFS status. It doesn't hurt to allocate enough space for both. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4xdr.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 206c08a60c7f..f8afa6783fb8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -141,13 +141,15 @@ static int nfs4_stat_to_errno(int);
XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
XDR_QUADLEN(NFS4_SETCLIENTID_NAMELEN) + \
1 /* sc_prog */ + \
- XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
- XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
+ 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
+ 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN) + \
1) /* sc_cb_ident */
#define decode_setclientid_maxsz \
(op_decode_hdr_maxsz + \
- 2 + \
- 1024) /* large value for CLID_INUSE */
+ 2 /* clientid */ + \
+ XDR_QUADLEN(NFS4_VERIFIER_SIZE) + \
+ 1 + XDR_QUADLEN(RPCBIND_MAXNETIDLEN) + \
+ 1 + XDR_QUADLEN(RPCBIND_MAXUADDRLEN))
#define encode_setclientid_confirm_maxsz \
(op_encode_hdr_maxsz + \
3 + (NFS4_VERIFIER_SIZE >> 2))