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xprtrdma: Fix trace point use-after-free race

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It's not safe to use resources pointed to by the @send_wr of
ib_post_send() _after_ that function returns. Those resources are
typically freed by the Send completion handler, which can run before
ib_post_send() returns.

Thus the trace points currently around ib_post_send() in the
client's RPC/RDMA transport are a hazard, even when they are
disabled. Rearrange them so that they touch the Work Request only
_before_ ib_post_send() is invoked.

Fixes: ab03eff58e ("xprtrdma: Add trace points in RPC Call transmit paths")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2020-04-19 20:03:05 -04:00 committed by Anna Schumaker
parent 58bd6656f8
commit bdb2ce8281
2 changed files with 5 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/trace/events/rpcrdma.h
View File

@ -692,11 +692,10 @@ TRACE_EVENT(xprtrdma_prepsend_failed,
TRACE_EVENT(xprtrdma_post_send,
TP_PROTO(
const struct rpcrdma_req *req,
int status
const struct rpcrdma_req *req
),
TP_ARGS(req, status),
TP_ARGS(req),
TP_STRUCT__entry(
__field(const void *, req)
@ -705,7 +704,6 @@ TRACE_EVENT(xprtrdma_post_send,
__field(unsigned int, client_id)
__field(int, num_sge)
__field(int, signaled)
__field(int, status)
),
TP_fast_assign(
@ -718,15 +716,13 @@ TRACE_EVENT(xprtrdma_post_send,
__entry->sc = req->rl_sendctx;
__entry->num_sge = req->rl_wr.num_sge;
__entry->signaled = req->rl_wr.send_flags & IB_SEND_SIGNALED;
__entry->status = status;
),
TP_printk("task:%u@%u req=%p sc=%p (%d SGE%s) %sstatus=%d",
TP_printk("task:%u@%u req=%p sc=%p (%d SGE%s) %s",
__entry->task_id, __entry->client_id,
__entry->req, __entry->sc, __entry->num_sge,
(__entry->num_sge == 1 ? "" : "s"),
(__entry->signaled ? "signaled " : ""),
__entry->status
(__entry->signaled ? "signaled" : "")
)
);

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

@ -1356,8 +1356,8 @@ int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
--ep->re_send_count;
}
trace_xprtrdma_post_send(req);
rc = frwr_send(r_xprt, req);
trace_xprtrdma_post_send(req, rc);
if (rc)
return -ENOTCONN;
return 0;