path: root/net
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authorChuck Lever <chuck.lever@oracle.com>2018-12-07 11:11:44 -0500
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-01-02 12:05:19 -0500
commit07e10308ee5da8e6132e0b737ece1c99dd651fb6 (patch)
tree1b5af1aca24cfbb01ea6d2f9b74f3f9d30a370a3 /net
parent9aeaf8cfcb71f3663737bc21b93da7e1b8845c0d (diff)
xprtrdma: Prevent leak of rpcrdma_rep objects
If a reply has been processed but the RPC is later retransmitted anyway, the req->rl_reply field still contains the only pointer to the old rpcrdma rep. When the next reply comes in, the reply handler will stomp on the rl_reply field, leaking the old rep. A trace event is added to capture such leaks. This problem seems to be worsened by the restructuring of the RPC Call path in v4.20. Fully addressing this issue will require at least a re-architecture of the disconnect logic, which is not appropriate during -rc. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net')
1 files changed, 4 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 062aee97b070..d18614e02b4e 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -1350,6 +1350,10 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
req = rpcr_to_rdmar(rqst);
+ if (req->rl_reply) {
+ trace_xprtrdma_leaked_rep(rqst, req->rl_reply);
+ rpcrdma_recv_buffer_put(req->rl_reply);
+ }
req->rl_reply = rep;
rep->rr_rqst = rqst;
clear_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);

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