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| author | Chuck Lever <chuck.lever@oracle.com> | 2016-10-28 22:22:33 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2016-11-01 15:23:58 -0400 |
| commit | 8d42629be0cb6c58a5c77cd02e47974c0e724e63 (patch) | |
| tree | 3d2146cfe4432350fb9b795cc38ff7c0f5602216 /net | |
| parent | 18e601d6adae5042f82d105ccd3d4498050f2ebf (diff) | |
| download | linux-8d42629be0cb6c58a5c77cd02e47974c0e724e63.tar.gz linux-8d42629be0cb6c58a5c77cd02e47974c0e724e63.tar.bz2 linux-8d42629be0cb6c58a5c77cd02e47974c0e724e63.zip | |
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: 68778945e46f ('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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index fc4535ead7c2..20027f8de129 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -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 |