git: 559fb03f9696 - stable/13 - rsu: add KASSERT to document maximum mbuf size in rsu_tx_start

The branch stable/13 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=559fb03f96961084a754388db5f4ffdc9df92002

commit 559fb03f96961084a754388db5f4ffdc9df92002
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2021-03-22 18:34:31 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2022-02-09 17:28:42 +0000

    rsu: add KASSERT to document maximum mbuf size in rsu_tx_start
    
    PR:             254479
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit 453d8a7ee2fc862f3a5e98185d57c8ad05cbc047)
---
 sys/dev/usb/wlan/if_rsu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/dev/usb/wlan/if_rsu.c b/sys/dev/usb/wlan/if_rsu.c
index ff0ec77b476c..747e3532cde4 100644
--- a/sys/dev/usb/wlan/if_rsu.c
+++ b/sys/dev/usb/wlan/if_rsu.c
@@ -2899,6 +2899,7 @@ rsu_tx_start(struct rsu_softc *sc, struct ieee80211_node *ni,
 	}
 
 	xferlen = sizeof(*txd) + m0->m_pkthdr.len;
+	KASSERT(xferlen <= RSU_TXBUFSZ, ("%s: invalid length", __func__));
 	m_copydata(m0, 0, m0->m_pkthdr.len, (caddr_t)&txd[1]);
 
 	data->buflen = xferlen;