From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0102EEB568 for ; Fri, 8 Sep 2023 18:24:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344368AbjIHSYh (ORCPT ); Fri, 8 Sep 2023 14:24:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242867AbjIHSX2 (ORCPT ); Fri, 8 Sep 2023 14:23:28 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECF6146BF; Fri, 8 Sep 2023 11:21:07 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1308BC43215; Fri, 8 Sep 2023 18:19:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1694197198; bh=rePj2G1W6HD98eg3roMIAWwNsbsRxFEcBbIR5habVuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jUPINFEdCtkZpM8OHsoluWxTKJUWB1c71B2Jtbb+ygxapKkmFem/qymOUhEhdR0iP HFYyHyM6Yj1QL4i428ha52uChwI5TlWk+IU9gsk8dt5VvaaStJI3ka7Q3FqWw05DTd FZbR/1VKJl1oThX5rDV8weUwJWgLbItvCL6gn5RlT3bjf6QE3e6A+SM0iFq4RK43ih WDV1xv0NHsdNVCp/Wy7RodY7gD93DY8J7REapxjD6P9PfnTjSBvHCNmFmqE8TnFSKg MOHQHm+F6yx9WkMZNrfJQt97F4qm4U1t0A0nDBLZYQTG96GQi3CQsN6XKjfVlBqE8K 8QRyZUSoCCRuQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Johannes Berg , syzbot+b2645b5bf1512b81fa22@syzkaller.appspotmail.com, Jeff Johnson , Sasha Levin , kvalo@kernel.org, linux-wireless@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 13/15] wifi: mac80211_hwsim: drop short frames Date: Fri, 8 Sep 2023 14:19:16 -0400 Message-Id: <20230908181920.3460520-13-sashal@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230908181920.3460520-1-sashal@kernel.org> References: <20230908181920.3460520-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.131 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Johannes Berg [ Upstream commit fba360a047d5eeeb9d4b7c3a9b1c8308980ce9a6 ] While technically some control frames like ACK are shorter and end after Address 1, such frames shouldn't be forwarded through wmediumd or similar userspace, so require the full 3-address header to avoid accessing invalid memory if shorter frames are passed in. Reported-by: syzbot+b2645b5bf1512b81fa22@syzkaller.appspotmail.com Reviewed-by: Jeff Johnson Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- drivers/net/wireless/mac80211_hwsim.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index c3c3b5aa87b0d..6eb3c845640bd 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -3693,14 +3693,15 @@ static int hwsim_cloned_frame_received_nl(struct sk_buff *skb_2, frame_data_len = nla_len(info->attrs[HWSIM_ATTR_FRAME]); frame_data = (void *)nla_data(info->attrs[HWSIM_ATTR_FRAME]); + if (frame_data_len < sizeof(struct ieee80211_hdr_3addr) || + frame_data_len > IEEE80211_MAX_DATA_LEN) + goto err; + /* Allocate new skb here */ skb = alloc_skb(frame_data_len, GFP_KERNEL); if (skb == NULL) goto err; - if (frame_data_len > IEEE80211_MAX_DATA_LEN) - goto err; - /* Copy the data */ skb_put_data(skb, frame_data, frame_data_len); -- 2.40.1