From patchwork Wed Dec 11 09:53:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Ren, Jianqi (Jacky) (CN)" X-Patchwork-Id: 13903199 Received: from mx0a-0064b401.pphosted.com (mx0a-0064b401.pphosted.com [205.220.166.238]) (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 2B47C1E9B2A; Wed, 11 Dec 2024 08:56:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.166.238 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733907394; cv=none; b=iXiAG7ouYcjPHopfD2bqgw9rUfAXJq9+cvmtYU5MRbpBa++++4YwS5GQInwsljVoBZeW+TAY3pDTkvVYinGPbJEUlaMymWXxXM7Em6/zOFKVmzg57ldzWoxRPEF7O+3vOFdmym/8yHRTWZxrlnJFSsWDo3BcS9EsS4xfHg/7QHk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733907394; c=relaxed/simple; bh=pxVjJM3xlHmqsLWloFW4wOs0kH3D8fuPRBOZEI5nH0Y=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=qpEOWe/LgmGFQ5F7bas2wQ19bW+FO4X8WIN1lK90zcZdL6Q6Lgt/IJv3+7cPGVPJERnLzx7gLJxq3a/5AQSwiWqEKPDfrSJ3ocTlRH/8ug+WcTxYyN856ALs5wkjqzagYM5MOOqoWrqAxUgb02tmh8X2niHy1H4vORTnIgx8ic0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=windriver.com; spf=pass smtp.mailfrom=windriver.com; arc=none smtp.client-ip=205.220.166.238 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=windriver.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=windriver.com Received: from pps.filterd (m0250809.ppops.net [127.0.0.1]) by mx0a-0064b401.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4BB5CHrY023873; Wed, 11 Dec 2024 00:56:01 -0800 Received: from ala-exchng02.corp.ad.wrs.com (ala-exchng02.wrs.com [147.11.82.254]) by mx0a-0064b401.pphosted.com (PPS) with ESMTPS id 43cwy1uyh1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Wed, 11 Dec 2024 00:56:01 -0800 (PST) Received: from ALA-EXCHNG02.corp.ad.wrs.com (147.11.82.254) by ALA-EXCHNG02.corp.ad.wrs.com (147.11.82.254) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.43; Wed, 11 Dec 2024 00:56:00 -0800 Received: from pek-lpg-core1.wrs.com (147.11.136.210) by ALA-EXCHNG02.corp.ad.wrs.com (147.11.82.254) with Microsoft SMTP Server id 15.1.2507.43 via Frontend Transport; Wed, 11 Dec 2024 00:55:58 -0800 From: To: , CC: , , , , , , Subject: [PATCH 6.1.y] cpufreq: amd-pstate: add check for cpufreq_cpu_get's return value Date: Wed, 11 Dec 2024 17:53:52 +0800 Message-ID: <20241211095352.2069266-1-jianqi.ren.cn@windriver.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: h-yDWQpBBybaH3vXFH1GtXAXkHiZr_ig X-Authority-Analysis: v=2.4 cv=eePHf6EH c=1 sm=1 tr=0 ts=675953a1 cx=c_pps a=K4BcnWQioVPsTJd46EJO2w==:117 a=K4BcnWQioVPsTJd46EJO2w==:17 a=RZcAm9yDv7YA:10 a=KP9VF9y3AAAA:8 a=HH5vDtPzAAAA:8 a=zd2uoN0lAAAA:8 a=KKAkSRfTAAAA:8 a=t7CeM3EgAAAA:8 a=T-_msMMreK8bA51VSmQA:9 a=4w0yzETBtB_scsjRCo-X:22 a=QM_-zKB-Ew0MsOlNKMB5:22 a=cvBusfyB2V15izCimMoJ:22 a=FdTzh2GWekK77mhwV6Dw:22 X-Proofpoint-GUID: h-yDWQpBBybaH3vXFH1GtXAXkHiZr_ig X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2024-12-11_08,2024-12-10_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=999 priorityscore=1501 spamscore=0 phishscore=0 malwarescore=0 mlxscore=0 adultscore=0 bulkscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.21.0-2411120000 definitions=main-2412110066 From: Anastasia Belova [ Upstream commit 5493f9714e4cdaf0ee7cec15899a231400cb1a9f ] cpufreq_cpu_get may return NULL. To avoid NULL-dereference check it and return in case of error. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Anastasia Belova Reviewed-by: Perry Yuan Signed-off-by: Viresh Kumar Signed-off-by: Jianqi Ren --- drivers/cpufreq/amd-pstate.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 90dcf26f0973..106aef210003 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -309,9 +309,14 @@ static void amd_pstate_adjust_perf(unsigned int cpu, unsigned long max_perf, min_perf, des_perf, cap_perf, lowest_nonlinear_perf, max_freq; struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); - struct amd_cpudata *cpudata = policy->driver_data; + struct amd_cpudata *cpudata; unsigned int target_freq; + if (!policy) + return; + + cpudata = policy->driver_data; + cap_perf = READ_ONCE(cpudata->highest_perf); lowest_nonlinear_perf = READ_ONCE(cpudata->lowest_nonlinear_perf); max_freq = READ_ONCE(cpudata->max_freq);