From fecd303882565954f58d984e4a13735e080b5263 Mon Sep 17 00:00:00 2001 From: Kristof Provost Date: Mon, 6 May 2024 11:39:08 +0200 Subject: [PATCH] if: guard against if_ioctl being NULL There are situations where an struct ifnet has a NULL if_ioctl pointer. For example, e6000sw creates such struct ifnets for each of its ports so it can call into the MII code. If there is then a link state event this calls do_link_state_change() -> rtnl_handle_ifevent() -> dump_iface() -> get_operstate() -> get_operstate_ether(). That wants to know if the link is up or down, so it tries to ioctl(SIOCGIFMEDIA), which doesn't go well if if_ioctl is NULL. Guard against this, and return EOPNOTSUPP. PR: 275920 MFC ater: 3 days Approved by: re (cperciva) Sponsored by: Rubicon Communications, LLC ("Netgate") (cherry picked from commit 43387b4e574043b78a58c8bcb7575161b055fce1) (cherry picked from commit 9a8a26aefb366ef6f497d48547a1562a1de566c1) --- sys/net/if.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sys/net/if.c b/sys/net/if.c index 0128fb8039e..1ca0893eb72 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -4873,6 +4873,9 @@ if_resolvemulti(if_t ifp, struct sockaddr **srcs, struct sockaddr *dst) int if_ioctl(if_t ifp, u_long cmd, void *data) { + if (ifp->if_ioctl == NULL) + return (EOPNOTSUPP); + return (ifp->if_ioctl(ifp, cmd, data)); }