[PATCH net] sctp: make sctp_setsockopt_events() less strict about the option length
From: Julien Gomes <hidden>
Date: 2019-02-06 20:25:00
Also in:
linux-sctp, lkml
Subsystem:
networking [general], sctp protocol, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Marcelo Ricardo Leitner, Xin Long, Linus Torvalds
Make sctp_setsockopt_events() able to accept sctp_event_subscribe structures longer than the current definitions. This should prevent unjustified setsockopt() failures due to struct sctp_event_subscribe extensions (as in 4.11 and 4.12) when using binaries that should be compatible, but were built with later kernel uapi headers. Signed-off-by: Julien Gomes <redacted> --- net/sctp/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9644bdc8e85c..f9717e2789da 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -2311,7 +2311,7 @@ static int sctp_setsockopt_events(struct sock *sk, char __user *optval, int i; if (optlen > sizeof(struct sctp_event_subscribe)) - return -EINVAL; + optlen = sizeof(struct sctp_event_subscribe); if (copy_from_user(&subscribe, optval, optlen)) return -EFAULT;
--
2.20.1