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rxrpc: Fix user call ID check in rxrpc_service_prealloc_one

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[ Upstream commit c01f6c9b3207e52fc9973a066a856ddf7a0538d8 ]

There just check the user call ID isn't already in use, hence should
compare user_call_ID with xcall->user_call_ID, which is current
node's user_call_ID.

Fixes: 540b1c48c37a ("rxrpc: Fix deadlock between call creation and sendmsg/recvmsg")
Suggested-by: David Howells <dhowells@redhat.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
YueHaibing 2018-08-01 13:27:23 +01:00 committed by Greg Kroah-Hartman
parent 83a46456c9
commit e0638b6a05
1 changed files with 2 additions and 2 deletions
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4
net/rxrpc/call_accept.c
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@ -115,9 +115,9 @@ static int rxrpc_service_prealloc_one(struct rxrpc_sock *rx,
while (*pp) {
parent = *pp;
xcall = rb_entry(parent, struct rxrpc_call, sock_node);
if (user_call_ID < call->user_call_ID)
if (user_call_ID < xcall->user_call_ID)
pp = &(*pp)->rb_left;
else if (user_call_ID > call->user_call_ID)
else if (user_call_ID > xcall->user_call_ID)
pp = &(*pp)->rb_right;
else
goto id_in_use;