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SUNRPC: Introduce xdr_stream-based decoders for RPCB_UNSET 

Replace the open-coded decode logic for rpcbind UNSET results with an
xdr_stream-based implementation, similar to what NFSv4 uses, to
protect against buffer overflows.

The new function is unused for the moment.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2009-08-09 15:09:42 -04:00 committed by Trond Myklebust
parent 0d36c4f757
commit 7ed0ff983c
1 changed files with 22 additions and 0 deletions
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22
net/sunrpc/rpcb_clnt.c
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@ -736,6 +736,28 @@ static int rpcb_decode_set(struct rpc_rqst *req, __be32 *p,
return 0;
}
static int rpcb_dec_set(struct rpc_rqst *req, __be32 *p,
unsigned int *boolp)
{
struct rpc_task *task = req->rq_task;
struct xdr_stream xdr;
xdr_init_decode(&xdr, &req->rq_rcv_buf, p);
p = xdr_inline_decode(&xdr, sizeof(__be32));
if (unlikely(p == NULL))
return -EIO;
*boolp = 0;
if (*p)
*boolp = 1;
dprintk("RPC: %5u RPCB_%s call %s\n",
task->tk_pid, task->tk_msg.rpc_proc->p_name,
(*boolp ? "succeeded" : "failed"));
return 0;
}
static int encode_rpcb_string(struct xdr_stream *xdr, const char *string,
const u32 maxstrlen)
{