linux-kernel - Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss

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Message-ID: <tencent_06AC9518E9DAEE02CC847A366C002D4D6C0A@qq.com>
Date: Wed,  7 May 2025 19:30:32 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+4bcdddd48bb6f0be0da1@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss_scan

#syz test

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 741e6c7edcb7..6842c3011a99 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1353,6 +1353,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 
+	if (!channels)
+		return -EINVAL;
 
 	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 				      sizeof(void *) * channels, GFP_KERNEL);