From f3ea53fb3bc3908b6e9ef39e53a75b55df7f78f8 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Tue, 1 Mar 2016 13:06:47 -0500 Subject: [PATCH] svcrdma: Use correct XID in error replies When constructing an error reply, svc_rdma_xdr_encode_error() needs to view the client's request message so it can get the failing request's XID. svc_rdma_xdr_decode_req() is supposed to return a pointer to the client's request header. But if it fails to decode the client's message (and thus an error reply is needed) it does not return the pointer. The server then sends a bogus XID in the error reply. Instead, unconditionally generate the pointer to the client's header in svc_rdma_recvfrom(), and pass that pointer to both functions. Signed-off-by: Chuck Lever Reviewed-by: Devesh Sharma Tested-by: Devesh Sharma Signed-off-by: J. Bruce Fields --- include/linux/sunrpc/svc_rdma.h | 2 +- net/sunrpc/xprtrdma/svc_rdma_marshal.c | 7 +------ net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 3 ++- 3 files changed, 4 insertions(+), 8 deletions(-) diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 42e852230a03..c2b0d95602d8 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -199,7 +199,7 @@ extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt, struct xdr_buf *rcvbuf); /* svc_rdma_marshal.c */ -extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *); +extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg *, struct svc_rqst *); extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *, struct rpcrdma_msg *, enum rpcrdma_errcode, __be32 *); diff --git a/net/sunrpc/xprtrdma/svc_rdma_marshal.c b/net/sunrpc/xprtrdma/svc_rdma_marshal.c index f74fc523d95b..b9ce01f6af90 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_marshal.c +++ b/net/sunrpc/xprtrdma/svc_rdma_marshal.c @@ -145,15 +145,11 @@ static __be32 *decode_reply_array(__be32 *va, __be32 *vaend) return (__be32 *)&ary->wc_array[nchunks]; } -int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req, - struct svc_rqst *rqstp) +int svc_rdma_xdr_decode_req(struct rpcrdma_msg *rmsgp, struct svc_rqst *rqstp) { - struct rpcrdma_msg *rmsgp = NULL; __be32 *va, *vaend; u32 hdr_len; - rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base; - /* Verify that there's enough bytes for header + something */ if (rqstp->rq_arg.len <= RPCRDMA_HDRLEN_MIN) { dprintk("svcrdma: header too short = %d\n", @@ -201,7 +197,6 @@ int svc_rdma_xdr_decode_req(struct rpcrdma_msg **rdma_req, hdr_len = (unsigned long)va - (unsigned long)rmsgp; rqstp->rq_arg.head[0].iov_len -= hdr_len; - *rdma_req = rmsgp; return hdr_len; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index 0f09052110a7..8f68cb6d89fe 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -653,7 +653,8 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp) rdma_build_arg_xdr(rqstp, ctxt, ctxt->byte_len); /* Decode the RDMA header. */ - ret = svc_rdma_xdr_decode_req(&rmsgp, rqstp); + rmsgp = (struct rpcrdma_msg *)rqstp->rq_arg.head[0].iov_base; + ret = svc_rdma_xdr_decode_req(rmsgp, rqstp); if (ret < 0) goto out_err; rqstp->rq_xprt_hlen = ret; -- 2.11.0