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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc13bf235fcsm684836a12.9.2026.08.17.05.45.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Aug 2026 05:45:56 -0700 (PDT) Message-ID: <8327e7fe-7acb-4fff-8347-b6d5fb4de427@oss.qualcomm.com> Date: Mon, 17 Aug 2026 20:45:50 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] cpufreq: acpi-cpufreq: fix P-state index mismatch in freq lookups To: lirongqing , "Rafael J . Wysocki" , Viresh Kumar , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260813090145.2450-1-lirongqing@baidu.com> Content-Language: en-US From: Zhongqiu Han Cc: zhongqiu.han@oss.qualcomm.com In-Reply-To: <20260813090145.2450-1-lirongqing@baidu.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE3MDA5NyBTYWx0ZWRfX+jTEzyUad/T0 6t3aAsJUMxfDEPZTrZj5L579p2ZpL2EogxhKaMWRAfi5SkJ2JA+wLtJRfIbxqtFvS3soe7Epq6M LGA3SC6vqcjEFSz4ptQZ4SA3Zmc7mNyY19YYJePD361qrWJH8DMVpepsYDR1WyTFeDXnTlm+rrO 6hWBvCbzlynxGEUyS0TIWz9gL0mpo2fJdA3u9Tjwhg4WmvrfdUmu9hCh+VnJogjSk51uIN0RxEf Ygcj+PxCxyV2tGBbH1YdTJLkdGnRN09CXvKR+ENASkO70TOOPatgtfoq28ogKev5tGmymRZS2F0 2BAzbiremBBFs8F1KLYVpI9radJJjwkJGP/mSKvHmABTpmkJeTy5GEWmlK2SK9hIt49BMPHIxfi QpPGNCOGD7SN+t9nJBzl1M7x9qHNplr9N+EAsmGqqy5Mwfh45txV5OHXovA9W538Y4hmTmEevrA nrFhu8c+AwjxvVK855w== X-Proofpoint-ORIG-GUID: NiWubUgfA5K9wtjcnzWKzNg7c1GnX1F8 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE3MDA5NyBTYWx0ZWRfX5jBXgQz7XLjv zHOeoy43YkGvdh4N6PLFVnGFShNbSOEFd+CZJQeEBtjARGIWodaXq0wL+5xCZ/9viqdhppv12sF nMkXjjkdBxZe0PEtgPW9DOxdwgbk3/Q= X-Proofpoint-GUID: NiWubUgfA5K9wtjcnzWKzNg7c1GnX1F8 X-Authority-Analysis: v=2.4 cv=WNhPmHsR c=1 sm=1 tr=0 ts=6a830286 cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=zuLzuavZAAAA:8 a=m2pJCCGmavP_bDTzO2wA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-17_01,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 phishscore=0 impostorscore=0 adultscore=0 malwarescore=0 clxscore=1015 priorityscore=1501 bulkscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608170097 On 8/13/2026 5:01 PM, lirongqing wrote: > From: Li RongQing > > policy->freq_table is built with duplicate _PSS frequencies dropped, so it > no longer lines up positionally with perf->states[]; the original P-state > index is kept in freq_table[].driver_data. extract_io() and > get_cur_freq_on_cpu() indexed freq_table[] with a perf->states[] index > anyway, which can return the frequency of a wrong P-state. > > Changes since v1: > - Reword patch 1: v1 described it as an out-of-bounds read, which is wrong; > it is an index-mismatch / wrong-result bug, not a memory-safety issue. > - Add patch 2 for get_cur_freq_on_cpu(). > - Add Fixes: tags (not exact, but reasonable backport targets). Hi RongQing, The Fixes tag should point to the commit that introduced the bug. > > Li RongQing (2): > cpufreq: acpi-cpufreq: fix P-state index mismatch in extract_io() > cpufreq: acpi-cpufreq: fix P-state index mismatch in > get_cur_freq_on_cpu() > > drivers/cpufreq/acpi-cpufreq.c | 18 ++++++++++++------ > 1 file changed, 12 insertions(+), 6 deletions(-) > -- Thx and BRs, Zhongqiu Han