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[80.39.29.32]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490454a0b9asm65790955e9.11.2026.05.22.14.10.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 May 2026 14:10:37 -0700 (PDT) Message-ID: <02a2bb69-c13d-43bb-bbed-2a1bd3007ba4@gmail.com> Date: Fri, 22 May 2026 23:10:36 +0200 Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Language: en-US, en-GB, es-ES To: Martin Wilck , Benjamin Marzinski , Christophe Varoqui Cc: DM_DEVEL-ML From: Xose Vazquez Perez Subject: [BUG] multipath-tools: 0 cyl reported on large disks due to overflow Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, An integer overflow occurs in libmultipath/discovery.c:get_geometry() when querying geometry on large disks resulting in "0 cyl" being reported: # multipath -ll -d -v3 ... | sdgm: 0 cyl, 64 heads, 32 sectors/track, start at 0 # fdisk -l /dev/sdgm Disk /dev/sdgm: 12 TiB, 13194139533312 bytes, 25769803776 sectors Units: sectors of 1 * 512 = 512 bytes # dmesg | grep sdgm sd 5:0:3:100: [sdgm] 25769803776 512-byte logical blocks: (13.2 TB/12.0TiB) The root cause is that struct hd_geometry, from libmultipath/structs.h, defines cylinders as an unsigned short. Since it is a legacy interface, it should either sanitize the log output or avoid relying on CHS geometry for large devices.