linux-kernel - Re: [syzbot] [wireless?] general protection fault in ieee80211_put_srates

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Message-Id: <20260119143815.198401-1-aha310510@gmail.com>
Date: Mon, 19 Jan 2026 23:38:15 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+81cd9dc1596563141d19@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] general protection fault in ieee80211_put_srates_elem

#syz test upstream master

---
 net/mac80211/mesh.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 68901f1def0d..eb3a346226bd 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -964,6 +964,8 @@ ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 	sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
 
 	sband = ieee80211_get_sband(sdata);
+	if (!sband)
+		return -EINVAL;
 
 	ie_len_he_cap = ieee80211_ie_len_he_cap(sdata);
 	ie_len_eht_cap = ieee80211_ie_len_eht_cap(sdata);
--