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authorDavid Howells <dhowells@redhat.com>2016-08-08 10:27:26 +0100
committerDavid Howells <dhowells@redhat.com>2016-08-09 17:12:23 +0100
commitf9dc575725baeaad8eb5262589f9aebeeaf13433 (patch)
treed662e7459b2cf9459629644ea9b604f50b666b44 /net
parent17b963e319449f709e78dc1ef445d797a13eecbc (diff)
rxrpc: Don't access connection from call if pointer is NULL
The call state machine processor sets up the message parameters for a UDP message that it might need to transmit in advance on the basis that there's a very good chance it's going to have to transmit either an ACK or an ABORT. This requires it to look in the connection struct to retrieve some of the parameters. However, if the call is complete, the call connection pointer may be NULL to dissuade the processor from transmitting a message. However, there are some situations where the processor is still going to be called - and it's still going to set up message parameters whether it needs them or not. This results in a NULL pointer dereference at: net/rxrpc/call_event.c:837 To fix this, skip the message pre-initialisation if there's no connection attached. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/rxrpc/call_event.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index f5e99163a09e..e60cf65c2232 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -837,6 +837,9 @@ void rxrpc_process_call(struct work_struct *work)
return;
}
+ if (!call->conn)
+ goto skip_msg_init;
+
/* there's a good chance we're going to have to send a message, so set
* one up in advance */
msg.msg_name = &call->conn->params.peer->srx.transport;
@@ -859,6 +862,7 @@ void rxrpc_process_call(struct work_struct *work)
memset(iov, 0, sizeof(iov));
iov[0].iov_base = &whdr;
iov[0].iov_len = sizeof(whdr);
+skip_msg_init:
/* deal with events of a final nature */
if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) {