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 DD50047CA7E; Sat, 12 Sep 2026 12:49:21 +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=1789217364; cv=none; b=l3VugETnvSufI/C8wMTQD6764uXEmievyPp7nygpDtJqtvgWfedKifCeifxh93s3D4NUNzBJLMXoaV9fBDu5bALIcDG1ohm7q21zOV3nhoUJF15td0p8PmRW2jemRi/MQN5ZpcMw1X0qESoTCdue2JDJ805EFQym3nLGMEYK9r4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789217364; c=relaxed/simple; bh=QF8KBLlmvxvHGsCYClcg+mvsotDz/l7mDTp7AFYqah4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OmzFCbHyLIzzrrfrQr7clqabHhMtfqkteNftRg7/ThdgWLIIc6Sd9QsyVQ38vfMaSodNHA66/izk6u9K2sd/1EMKfhghBnyBopcwFbpZF1yIYNbDZvBSjF10KnqDQpeiWtFfdYafrnr6fML7HeFnWaipP/5SJlnQu5J598ATyc0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q2BTaqgB; 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="Q2BTaqgB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D283D1F000FF; Sat, 12 Sep 2026 12:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789217360; bh=Z5L6J8PbqEb9uSlSxWARm4Pob1RsqH0IRypuQ/00fVw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Q2BTaqgBlET8XV0DZeC77XY94JeY0xR/Fd4tllSiQKJH9xSp3zd4V776kvPflnHiF hcZdXaHBDwmbTFK56s2KBUtdJzBCOQJD2EEtweZCMaDUp0jIIQR016PiKPkVsoA8ys ME1z19PIVVYILuyhR6dsOkpf8R7iTLrVWk2HtuE4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Karl Mehltretter , Viresh Kumar , Sasha Levin Subject: [PATCH 6.12 0923/1376] cpufreq: imx6q: fix out-of-bounds write when probed more than once Date: Sat, 12 Sep 2026 08:55:49 +0200 Message-ID: <20260912065628.137026962@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Karl Mehltretter [ Upstream commit 8c3afcf27fa4582c1ab912503dc8a4ebb8dc0f82 ] imx6_soc_volt is allocated fresh on every probe, sized to the number of ARM OPPs: imx6_soc_volt = devm_kcalloc(cpu_dev, num, sizeof(*imx6_soc_volt), GFP_KERNEL); but it is filled through soc_opp_count, which has static storage and is never reset. A second bind after an unbind keeps indexing from where the first one stopped, and writes past the end of the new array. Unbinding and rebinding the driver on qemu's mcimx6ul-evk, under KASAN: BUG: KASAN: slab-out-of-bounds in imx6q_cpufreq_probe+0x3b0/0xa34 Write of size 4 at addr c5e90480 by task binder/73 imx6q_cpufreq_probe from platform_probe+0x88/0xe4 platform_probe from really_probe+0x108/0x384 bind_store from kernfs_fop_write_iter+0x1b4/0x28c The write lands one u32 past the end of the allocation. soc_opp_count is only read a few lines below the loop that fills it, so it never needed static storage. Make it a local. Fixes: b4573d1d657a ("cpufreq: imx6q: correct VDDSOC/PU voltage scaling when cpufreq is changed") Assisted-by: Claude:claude-opus-5 Signed-off-by: Karl Mehltretter Signed-off-by: Viresh Kumar Signed-off-by: Sasha Levin --- drivers/cpufreq/imx6q-cpufreq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/imx6q-cpufreq.c b/drivers/cpufreq/imx6q-cpufreq.c index 853534f0fec88..51520307c4b04 100644 --- a/drivers/cpufreq/imx6q-cpufreq.c +++ b/drivers/cpufreq/imx6q-cpufreq.c @@ -55,7 +55,6 @@ static unsigned int max_freq; static unsigned int transition_latency; static u32 *imx6_soc_volt; -static u32 soc_opp_count; static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index) { @@ -331,6 +330,7 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev) const struct property *prop; const __be32 *val; u32 nr, i, j; + u32 soc_opp_count = 0; cpu_dev = get_cpu_device(0); if (!cpu_dev) { -- 2.53.0