From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B410C13D896; Tue, 23 Jul 2024 18:41:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721760101; cv=none; b=b3bQwj6kqlfniAYmeBX3DYRIn7E3TsJ4Ie5uROy3f/mLxn99Fv2jaXPQOnsZXibP46poAlWGmuWSsqX9SC65iRUREGrsB+yiDZcflHt1OlyGH23YM0hvYGGwKLNLF1Dqusjgf1gLm0UUgeSxfPOfSY6P0THptZr76LM3Rzj2KpI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721760101; c=relaxed/simple; bh=Pm3Rt/piY2pWyNbie01Dzusgm2DjtxOVKbZ7wcpENIg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QI6+BdMxhsSPeiShHQoCUOkWiMpMDE7vIShgHC+X5lhiPb3Zo066hSzE4oaRv1HSS3YrJHflFJlHKWasd77MYqgzpazKiI6HX9PYXPTrZkkZGyypfVMcR2q+8o7w9NiH0UbRKiB2zzmKw97gtVwg3wtP49QrLo9KRAUKQjrlTXc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=L/CE+OSg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="L/CE+OSg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 39EC9C4AF0A; Tue, 23 Jul 2024 18:41:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721760101; bh=Pm3Rt/piY2pWyNbie01Dzusgm2DjtxOVKbZ7wcpENIg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L/CE+OSgtjMXt8h9AxGJcGC4PdYWn8hBeetGB5oLk73zLiwqw8lrcSO8Pyp7p1rYQ Qu27VXjhcHF8hQuJsgo1C1Yq1w24GzanoEYhnYyIUONxrzv+rrZgoXyXtRx5q0qR6l tzZsgP9b4sl005CyRfCcOplXfFcMsy8D7ymaBzcY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kees Cook , Kenton Groombridge , Johannes Berg , Sasha Levin , Kees Cook Subject: [PATCH 6.9 072/163] wifi: mac80211: Avoid address calculations via out of bounds array indexing Date: Tue, 23 Jul 2024 20:23:21 +0200 Message-ID: <20240723180146.251270085@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240723180143.461739294@linuxfoundation.org> References: <20240723180143.461739294@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Kenton Groombridge [ Upstream commit 2663d0462eb32ae7c9b035300ab6b1523886c718 ] req->n_channels must be set before req->channels[] can be used. This patch fixes one of the issues encountered in [1]. [ 83.964255] UBSAN: array-index-out-of-bounds in net/mac80211/scan.c:364:4 [ 83.964258] index 0 is out of range for type 'struct ieee80211_channel *[]' [...] [ 83.964264] Call Trace: [ 83.964267] [ 83.964269] dump_stack_lvl+0x3f/0xc0 [ 83.964274] __ubsan_handle_out_of_bounds+0xec/0x110 [ 83.964278] ieee80211_prep_hw_scan+0x2db/0x4b0 [ 83.964281] __ieee80211_start_scan+0x601/0x990 [ 83.964291] nl80211_trigger_scan+0x874/0x980 [ 83.964295] genl_family_rcv_msg_doit+0xe8/0x160 [ 83.964298] genl_rcv_msg+0x240/0x270 [...] [1] https://bugzilla.kernel.org/show_bug.cgi?id=218810 Co-authored-by: Kees Cook Signed-off-by: Kees Cook Signed-off-by: Kenton Groombridge Link: https://msgid.link/20240605152218.236061-1-concord@gentoo.org Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/scan.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 8ecc4b710b0e6..b5f2df61c7f67 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -358,7 +358,8 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) struct cfg80211_scan_request *req; struct cfg80211_chan_def chandef; u8 bands_used = 0; - int i, ielen, n_chans; + int i, ielen; + u32 *n_chans; u32 flags = 0; req = rcu_dereference_protected(local->scan_req, @@ -368,34 +369,34 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata) return false; if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) { + local->hw_scan_req->req.n_channels = req->n_channels; + for (i = 0; i < req->n_channels; i++) { local->hw_scan_req->req.channels[i] = req->channels[i]; bands_used |= BIT(req->channels[i]->band); } - - n_chans = req->n_channels; } else { do { if (local->hw_scan_band == NUM_NL80211_BANDS) return false; - n_chans = 0; + n_chans = &local->hw_scan_req->req.n_channels; + *n_chans = 0; for (i = 0; i < req->n_channels; i++) { if (req->channels[i]->band != local->hw_scan_band) continue; - local->hw_scan_req->req.channels[n_chans] = + local->hw_scan_req->req.channels[(*n_chans)++] = req->channels[i]; - n_chans++; + bands_used |= BIT(req->channels[i]->band); } local->hw_scan_band++; - } while (!n_chans); + } while (!*n_chans); } - local->hw_scan_req->req.n_channels = n_chans; ieee80211_prepare_scan_chandef(&chandef); if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT) -- 2.43.0