git: 896dc30bc9bc - main - iflib: fix iflib_simple_transmit() when interface is down

The branch main has been updated by gallatin:

URL: https://cgit.FreeBSD.org/src/commit/?id=896dc30bc9bc2f7407b04ca4c08f88b1c7bf9d60

commit 896dc30bc9bc2f7407b04ca4c08f88b1c7bf9d60
Author:     Andrew Gallatin <gallatin@FreeBSD.org>
AuthorDate: 2025-11-20 00:48:56 +0000
Commit:     Andrew Gallatin <gallatin@FreeBSD.org>
CommitDate: 2025-11-20 00:48:56 +0000

    iflib: fix iflib_simple_transmit() when interface is down
    
    Use the same check as iflib_if_transmit() to detect when the
    interface is down and return the proper error code, and also
    free the mbuf.
    
    This fixes an mbuf leak when a member of a lagg is brought
    down (and probably many other scenarios).
    
    Sponsored by: Netflix
---
 sys/net/iflib.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/sys/net/iflib.c b/sys/net/iflib.c
index ad2be119da7c..3181bdbcb849 100644
--- a/sys/net/iflib.c
+++ b/sys/net/iflib.c
@@ -7188,9 +7188,13 @@ iflib_simple_transmit(if_t ifp, struct mbuf *m)
 
 
 	ctx = if_getsoftc(ifp);
-	if ((if_getdrvflags(ifp) & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
-	    IFF_DRV_RUNNING)
-		return (EBUSY);
+	if (__predict_false((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0
+		|| !LINK_ACTIVE(ctx))) {
+		DBG_COUNTER_INC(tx_frees);
+		m_freem(m);
+		return (ENETDOWN);
+	}
+
 	txq = iflib_simple_select_queue(ctx, m);
 	mtx_lock(&txq->ift_mtx);
 	error = iflib_encap(txq, &m);