redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

svcrdma: Fix another Receive buffer leak 

[ Upstream commit 64d2642251 ]

During a connection tear down, the Receive queue is flushed before
the device resources are freed. Typically, all the Receives flush
with IB_WR_FLUSH_ERR.

However, any pending successful Receives flush with IB_WR_SUCCESS,
and the server automatically posts a fresh Receive to replace the
completing one. This happens even after the connection has closed
and the RQ is drained. Receives that are posted after the RQ is
drained appear never to complete, causing a Receive resource leak.
The leaked Receive buffer is left DMA-mapped.

To prevent these late-posted recv_ctxt's from leaking, block new
Receive posting after XPT_CLOSE is set.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Chuck Lever 2020-06-30 15:55:45 -04:00 committed by Greg Kroah-Hartman
parent 7aca2f7d17
commit 8fe5e38acb
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
View File

@ -265,6 +265,8 @@ static int svc_rdma_post_recv(struct svcxprt_rdma *rdma)
{
struct svc_rdma_recv_ctxt *ctxt;
if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags))
return 0;
ctxt = svc_rdma_recv_ctxt_get(rdma);
if (!ctxt)
return -ENOMEM;