From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 BA6533D1CC6; Wed, 20 May 2026 18:29:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301799; cv=none; b=Z56tyJp/Xg6vRYI1ZbyirY20gOxkEOp44EJGLG0kEyf+Q14GPyYuAJ67jEqallY+H1A8yYP47O+xZHGR9xxMhX+0g41luwh8qWrRfECkvhLVdS72Fm3MhewCHR0IozG/msyIJfAnKP0rR+LRCtlM/6CaH4xOIxfHl+VyHaypaOc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301799; c=relaxed/simple; bh=zf1SpcqoQCX0c4Bl6vPmQb3eIaNogy+P9qaY1Umtvgg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IVPtoI4Uii98qNLXeOJWqhpwYG4LgOSTQ50UtgLWae9qAcQv77CnSCvAOvbak2NpATyJ2k/dVCphrhb15Gz7PGIg1jnj76W47dAvmneh3+jfecwUb/n6c0//J15wkEO8nBSza2PNPjtjNzrSiktebLxEf9Fe1C+Du1djt2hY20s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wCqGD5Iz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="wCqGD5Iz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B4571F000E9; Wed, 20 May 2026 18:29:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779301797; bh=UpInOkIM80u3SkqttUuVW8iCPXotPPp6FmwqK55VqcI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wCqGD5IzIyHbP2RZdDXtbQowp2KC4aM3hgWTOMuUOAnD8SwdRqLSiWIoEM8LUNyaX e9QFPIZQ2c/3eYPpd9eOr3LIW1egUbnFy8YbFqDRmKPli3UlW28tWi2vef8QAT2vWo T2yHBNSPVL2r9JWednrjE+CRkR1g4s2hMsr30qag= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Duoming Zhou , Ping-Ke Shih , Sasha Levin Subject: [PATCH 6.6 024/508] wifi: rtlwifi: pci: fix possible use-after-free caused by unfinished irq_prepare_bcn_tasklet Date: Wed, 20 May 2026 18:17:27 +0200 Message-ID: <20260520162059.114752990@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162058.573354582@linuxfoundation.org> References: <20260520162058.573354582@linuxfoundation.org> User-Agent: quilt/0.69 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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Duoming Zhou [ Upstream commit 039cd522dc70151da13329a5e3ae19b1736f468a ] The irq_prepare_bcn_tasklet is initialized in rtl_pci_init() and scheduled when RTL_IMR_BCNINT interrupt is triggered by hardware. But it is never killed in rtl_pci_deinit(). When the rtlwifi card probe fails or is being detached, the ieee80211_hw is deallocated. However, irq_prepare_bcn_tasklet may still be running or pending, leading to use-after-free when the freed ieee80211_hw is accessed in _rtl_pci_prepare_bcn_tasklet(). Similar to irq_tasklet, add tasklet_kill() in rtl_pci_deinit() to ensure that irq_prepare_bcn_tasklet is properly terminated before the ieee80211_hw is released. The issue was identified through static analysis. Fixes: 0c8173385e54 ("rtl8192ce: Add new driver") Signed-off-by: Duoming Zhou Acked-by: Ping-Ke Shih Signed-off-by: Ping-Ke Shih Link: https://patch.msgid.link/20260223045522.48377-1-duoming@zju.edu.cn Signed-off-by: Sasha Levin --- drivers/net/wireless/realtek/rtlwifi/pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c index 40112b2c37775..b978d31e47ca9 100644 --- a/drivers/net/wireless/realtek/rtlwifi/pci.c +++ b/drivers/net/wireless/realtek/rtlwifi/pci.c @@ -1675,6 +1675,7 @@ static void rtl_pci_deinit(struct ieee80211_hw *hw) synchronize_irq(rtlpci->pdev->irq); tasklet_kill(&rtlpriv->works.irq_tasklet); + tasklet_kill(&rtlpriv->works.irq_prepare_bcn_tasklet); cancel_work_sync(&rtlpriv->works.lps_change_work); } -- 2.53.0