From: Chuck Lever <chuck.lever@xxxxxxxxxx>
commit ffc4d9b1596c34caa98962722e930e97912c8a9f upstream.
Preserve any rpcrdma_req that is attached to rpc_rqst's allocated
for the backchannel. Otherwise, after all the pre-allocated
backchannel req's are consumed, incoming backward calls start
writing on freed memory.
Somehow this hunk got lost.
Fixes: f531a5dbc451 ('xprtrdma: Pre-allocate backward rpc_rqst')
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Tested-by: Devesh Sharma <devesh.sharma@xxxxxxxxxxxxx>
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sunrpc/xprtrdma/transport.c | 3 +++
1 file changed, 3 insertions(+)
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -576,6 +576,9 @@ xprt_rdma_free(void *buffer)
rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]);
req = rb->rg_owner;
+ if (req->rl_backchannel)
+ return;
+
r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply);
