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svcrdma: backchannel cannot share a page for send and rcv buffers 

The underlying transport releases the page pointed to by rq_buffer
during xprt_rdma_bc_send_request. When the backchannel reply arrives,
rq_rbuffer then points to freed memory.

Fixes: 68778945e4 ('SUNRPC: Separate buffer pointers for RPC ...')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2016-10-28 22:22:33 -04:00 committed by J. Bruce Fields
parent 18e601d6ad
commit 8d42629be0
1 changed files with 10 additions and 3 deletions
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13
net/sunrpc/xprtrdma/svc_rdma_backchannel.c
View File

@ -177,19 +177,26 @@ xprt_rdma_bc_allocate(struct rpc_task *task)
return -EINVAL;
}
/* svc_rdma_sendto releases this page */
page = alloc_page(RPCRDMA_DEF_GFP);
if (!page)
return -ENOMEM;
rqst->rq_buffer = page_address(page);
rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
rqst->rq_rbuffer = kmalloc(rqst->rq_rcvsize, RPCRDMA_DEF_GFP);
if (!rqst->rq_rbuffer) {
put_page(page);
return -ENOMEM;
}
return 0;
}
static void
xprt_rdma_bc_free(struct rpc_task *task)
{
/* No-op: ctxt and page have already been freed. */
struct rpc_rqst *rqst = task->tk_rqstp;
kfree(rqst->rq_rbuffer);
}
static int