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SUNRPC: Ensure the transport backchannel association

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If the server sends CB_ calls on a connection that is not associated
with the backchannel, refuse to process the call and shut down the
connection.  This avoids a NULL dereference crash in
xprt_complete_bc_request().  There's not much more we can do in this
situation unless we want to look into allowing all connections to be
associated with the fore and back channel.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Benjamin Coddington 2021-03-22 14:37:01 -04:00 committed by Trond Myklebust
parent c9301cb35b
commit 98b5cee373
1 changed files with 4 additions and 0 deletions
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4
net/sunrpc/xprtsock.c
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@ -558,6 +558,10 @@ xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
struct rpc_rqst *req;
ssize_t ret;
/* Is this transport associated with the backchannel? */
if (!xprt->bc_serv)
return -ESHUTDOWN;
/* Look up and lock the request corresponding to the given XID */
req = xprt_lookup_bc_request(xprt, transport->recv.xid);
if (!req) {