nfsd4: fix bad bounds checking

A number of spots in the xdr decoding follow a pattern like

	n = be32_to_cpup(p++);
	READ_BUF(n + 4);

where n is a u32.  The only bounds checking is done in READ_BUF itself,
but since it's checking (n + 4), it won't catch cases where n is very
large, (u32)(-4) or higher.  I'm not sure exactly what the consequences
are, but we've seen crashes soon after.

Instead, just break these up into two READ_BUF()s.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index d6ef095..1600ec4 100644 (file)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1072,8 +1072,9 @@ nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename
 
        READ_BUF(4);
        rename->rn_snamelen = be32_to_cpup(p++);
-       READ_BUF(rename->rn_snamelen + 4);
+       READ_BUF(rename->rn_snamelen);
        SAVEMEM(rename->rn_sname, rename->rn_snamelen);
+       READ_BUF(4);
        rename->rn_tnamelen = be32_to_cpup(p++);
        READ_BUF(rename->rn_tnamelen);
        SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
@@ -1155,13 +1156,14 @@ nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclient
        READ_BUF(8);
        setclientid->se_callback_prog = be32_to_cpup(p++);
        setclientid->se_callback_netid_len = be32_to_cpup(p++);
-
-       READ_BUF(setclientid->se_callback_netid_len + 4);
+       READ_BUF(setclientid->se_callback_netid_len);
        SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
+       READ_BUF(4);
        setclientid->se_callback_addr_len = be32_to_cpup(p++);
 
-       READ_BUF(setclientid->se_callback_addr_len + 4);
+       READ_BUF(setclientid->se_callback_addr_len);
        SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
+       READ_BUF(4);
        setclientid->se_callback_ident = be32_to_cpup(p++);
 
        DECODE_TAIL;
@@ -1835,8 +1837,9 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 
        READ_BUF(4);
        argp->taglen = be32_to_cpup(p++);
-       READ_BUF(argp->taglen + 8);
+       READ_BUF(argp->taglen);
        SAVEMEM(argp->tag, argp->taglen);
+       READ_BUF(8);
        argp->minorversion = be32_to_cpup(p++);
        argp->opcnt = be32_to_cpup(p++);
        max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);