tree 3b0a8ffd2ffa7c0d97d4456007032fc902e9ee1c
parent 66a04cd140f282551adb1267a8c137fad05c3eb1
author Chuck Lever <chuck.lever@oracle.com> 1585688553 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1588433152 +0200

svcrdma: Fix leak of svc_rdma_recv_ctxt objects

commit 23cf1ee1f1869966b75518c59b5cbda4c6c92450 upstream.

Utilize the xpo_release_rqst transport method to ensure that each
rqstp's svc_rdma_recv_ctxt object is released even when the server
cannot return a Reply for that rqstp.

Without this fix, each RPC whose Reply cannot be sent leaks one
svc_rdma_recv_ctxt. This is a 2.5KB structure, a 4KB DMA-mapped
Receive buffer, and any pages that might be part of the Reply
message.

The leak is infrequent unless the network fabric is unreliable or
Kerberos is in use, as GSS sequence window overruns, which result
in connection loss, are more common on fast transports.

Fixes: 3a88092ee319 ("svcrdma: Preserve Receive buffer until svc_rdma_sendto")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>