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authorChuck Lever <chuck.lever@oracle.com>2007-10-26 13:32:03 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-01-30 02:05:44 -0500
commitbcecff77a9c743ff67fdddeabc30ef76a6877886 (patch)
tree0e7a30f308501f87fbdad6fe65321b8bc35d89f9 /fs
parentc957c526ef86e472359dadb4204dab8a503b687d (diff)
NFS: Use unsigned intermediates for manipulating header lengths (NFSv4 XDR)
Clean up: prevent length underflow and mixed sign comparison when unmarshalling NFS version 4 getacl, readdir, and readlink replies. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4xdr.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 51dd3804866..2e1fe171bf7 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -3476,10 +3476,11 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct page *page = *rcvbuf->pages;
struct kvec *iov = rcvbuf->head;
- unsigned int nr, pglen = rcvbuf->page_len;
+ size_t hdrlen;
+ u32 recvd, pglen = rcvbuf->page_len;
__be32 *end, *entry, *p, *kaddr;
- uint32_t len, attrlen, xlen;
- int hdrlen, recvd, status;
+ unsigned int nr;
+ int status;
status = decode_op_hdr(xdr, OP_READDIR);
if (status)
@@ -3503,6 +3504,7 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
end = p + ((pglen + readdir->pgbase) >> 2);
entry = p;
for (nr = 0; *p++; nr++) {
+ u32 len, attrlen, xlen;
if (end - p < 3)
goto short_pkt;
dprintk("cookie = %Lu, ", *((unsigned long long *)p));
@@ -3551,7 +3553,8 @@ static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
{
struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
struct kvec *iov = rcvbuf->head;
- int hdrlen, len, recvd;
+ size_t hdrlen;
+ u32 len, recvd;
__be32 *p;
char *kaddr;
int status;
@@ -3646,7 +3649,8 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
return -EIO;
if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
- int hdrlen, recvd;
+ size_t hdrlen;
+ u32 recvd;
/* We ignore &savep and don't do consistency checks on
* the attr length. Let userspace figure it out.... */