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RDMA/ucma.c: Fix for events with wrong context on iWARP 

It is possible for asynchronous RDMA_CM_EVENT_ESTABLISHED events to be
generated with ctx->uid == 0, because ucma_set_event_context() copies
ctx->uid to the event structure outside of ctx->file->mut.  This leads
to a crash in the userspace library, since it gets a bogus event.

Fix this by taking the mutex a bit earlier in ucma_event_handler.

Signed-off-by: Tatyana Nikolova <Tatyana.E.Nikolova@intel.com>
Signed-off-by: Sean Hefty <Sean.Hefty@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Tatyana Nikolova 2012-08-03 23:59:41 +00:00 committed by Roland Dreier
parent 0d7614f09c
commit 418edaaba9
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/ucma.c
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@ -267,6 +267,7 @@ static int ucma_event_handler(struct rdma_cm_id *cm_id,
if (!uevent)
return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
mutex_lock(&ctx->file->mut);
uevent->cm_id = cm_id;
ucma_set_event_context(ctx, event, uevent);
uevent->resp.event = event->event;
@ -277,7 +278,6 @@ static int ucma_event_handler(struct rdma_cm_id *cm_id,
ucma_copy_conn_event(&uevent->resp.param.conn,
&event->param.conn);
mutex_lock(&ctx->file->mut);
if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
if (!ctx->backlog) {
ret = -ENOMEM;