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xprtrdma: Throw away reply when version is unrecognized

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A reply with an unrecognized value in the version field means the
transport header is potentially garbled and therefore all the fields
are untrustworthy.

Fixes: 59aa1f9a3c ("xprtrdma: Properly handle RDMA_ERROR ... ")
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 2017-10-16 15:01:06 -04:00 committed by Anna Schumaker
parent 2b4f8923ec
commit 61433af560
1 changed files with 8 additions and 9 deletions
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17
net/sunrpc/xprtrdma/rpc_rdma.c
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@ -1248,6 +1248,9 @@ rpcrdma_reply_handler(struct work_struct *work)
p++; /* credits */
proc = *p++;
if (vers != rpcrdma_version)
goto out_badversion;
if (rpcrdma_is_bcall(r_xprt, rep, xid, proc))
return;
@ -1280,8 +1283,6 @@ rpcrdma_reply_handler(struct work_struct *work)
}
xprt->reestablish_timeout = 0;
if (vers != rpcrdma_version)
goto out_badversion;
switch (proc) {
case rdma_msg:
@ -1321,17 +1322,15 @@ out_badstatus:
}
return;
out_badversion:
dprintk("RPC: %s: invalid version %d\n",
__func__, be32_to_cpu(vers));
goto repost;
/* If the incoming reply terminated a pending RPC, the next
* RPC call will post a replacement receive buffer as it is
* being marshaled.
*/
out_badversion:
dprintk("RPC: %s: invalid version %d\n",
__func__, be32_to_cpu(vers));
status = -EIO;
r_xprt->rx_stats.bad_reply_count++;
goto out;
out_badheader:
dprintk("RPC: %5u %s: invalid rpcrdma reply (type %u)\n",
rqst->rq_task->tk_pid, __func__, be32_to_cpu(proc));