Re: [syzbot] [wireless?] general protection fault in ieee80211_put_srates_elem

[Jeongjun Park]

#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);
--