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 E55F76DD02; Tue, 12 Dec 2023 13:48:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="I1bcz+Ll" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1063C433C7; Tue, 12 Dec 2023 13:48:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702388919; bh=vMWkOLosreYFfJ9xVON5sXNCA2fynG36OvDNxFrE51s=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=I1bcz+LlvgB6SRxGT6ZdgATiv1KLf3q9mLiOckLOH//Bt/WfHe+7KJ4pbFikHCrFd qinaFVog666Obq0FK2VsYMwyGYl78WaUh9i5/l3r1GPgscTC2S+QgVEDEk45EOEOb7 l+JB3Lc3Pke9d+OyFaOvCmY34jxCo/DG2g76bTPjQW0SRGR6BCKhbMLmFvTSCMmU0d fQUool7HZlBQtY2ymybxrXQtnzo4alFNJsup3EQhmQBQ1MyjAU6w3ZDvAgWqDQynrX fqcIm0zsaTs7nbljdzhOr2nUNP/jaTsp25PQ1td9yIfjPwBY/vMyUnkzvfaGwD/Mxm cKHo+xDe9ZFRA== Date: Tue, 12 Dec 2023 13:48:31 +0000 From: Lee Jones To: Zheng Wang Cc: aspriel@gmail.com, franky.lin@broadcom.com, hante.meuleman@broadcom.com, kvalo@kernel.org, johannes.berg@intel.com, marcan@marcan.st, linus.walleij@linaro.org, jisoo.jang@yonsei.ac.kr, linuxlovemin@yonsei.ac.kr, wataru.gohda@cypress.com, linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, arend.vanspriel@broadcom.com, SHA-cyfmac-dev-list@infineon.com, linux-kernel@vger.kernel.org, security@kernel.org, stable@vger.kernel.org, hackerzheng666@gmail.com Subject: Re: [PATCH v5] wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach Message-ID: <20231212134831.GA564365@google.com> References: <20231106141704.866455-1-zyytlz.wz@163.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231106141704.866455-1-zyytlz.wz@163.com> On Mon, 06 Nov 2023, Zheng Wang wrote: > This is the candidate patch of CVE-2023-47233 : > https://nvd.nist.gov/vuln/detail/CVE-2023-47233 > > In brcm80211 driver,it starts with the following invoking chain > to start init a timeout worker: > > ->brcmf_usb_probe > ->brcmf_usb_probe_cb > ->brcmf_attach > ->brcmf_bus_started > ->brcmf_cfg80211_attach > ->wl_init_priv > ->brcmf_init_escan > ->INIT_WORK(&cfg->escan_timeout_work, > brcmf_cfg80211_escan_timeout_worker); > > If we disconnect the USB by hotplug, it will call > brcmf_usb_disconnect to make cleanup. The invoking chain is : > > brcmf_usb_disconnect > ->brcmf_usb_disconnect_cb > ->brcmf_detach > ->brcmf_cfg80211_detach > ->kfree(cfg); > > While the timeout woker may still be running. This will cause > a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker. > > Fix it by deleting the timer and canceling the worker in > brcmf_cfg80211_detach. > > Fixes: e756af5b30b0 ("brcmfmac: add e-scan support.") > Signed-off-by: Zheng Wang > Cc: stable@vger.kernel.org > --- > v5: > - replace del_timer_sync with timer_shutdown_sync suggested by > Arend and Takashi > v4: > - rename the subject and add CVE number as Ping-Ke Shih suggested > v3: > - rename the subject as Johannes suggested > v2: > - fix the error of kernel test bot reported > --- > drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > index 667462369a32..a8723a61c9e4 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c > @@ -8431,6 +8431,8 @@ void brcmf_cfg80211_detach(struct brcmf_cfg80211_info *cfg) > if (!cfg) > return; > > + timer_shutdown_sync(&cfg->escan_timeout); > + cancel_work_sync(&cfg->escan_timeout_work); > brcmf_pno_detach(cfg); > brcmf_btcoex_detach(cfg); > wiphy_unregister(cfg->wiphy); Has there been any progress on this please? Are we expecting a v6 to this? -- Lee Jones [李琼斯]