SUNRPC: Fix a nfs4 over rdma transport oops
Prevent an RPC oops when freeing a dynamically allocated RDMA
buffer, used in certain special-case large metadata operations.
Signed-off-by: Tom Talpey <tmt@netapp.com>
Signed-off-by: James Lentini <jlentini@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 02c522c..a564c1a 100644
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -614,7 +614,11 @@
return;
req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]);
- r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
+ if (req->rl_iov.length == 0) { /* see allocate above */
+ r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer,
+ struct rpcrdma_xprt, rx_buf);
+ } else
+ r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
rep = req->rl_reply;
dprintk("RPC: %s: called on 0x%p%s\n",