linux-kernel - "UBSAN: division-overflow in bdi_set_max

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Message-ID: <CAKHoSAsACp1ebN3jxwgj-85G90eqaY+BO8kWxkhMib12vhU3Ew@mail.gmail.com>
Date: Wed, 15 Jan 2025 10:28:48 +0800
From: cheung wall <zzqq0103.hey@...il.com>
To: linux-kernel@...r.kernel.org
Subject: "UBSAN: division-overflow in bdi_set_max_bytes" in Linux Kernel v6.12-rc4

Hello,

I am writing to report a potential vulnerability identified in the
Linux Kernel version v6.12-rc4. This vulnerability was discovered
while i was testing the kernel.

Linux Kernel Repository Git Commit:
42f7652d3eb527d03665b09edac47f85fb600924 (tag: v6.12-rc4)

Bug Location: UBSAN: division-overflow in ./include/linux/math64.h:69:18

Bug report: https://pastebin.com/WJKB2YvM

Entire Log: https://pastebin.com/WNBGfPxv

Thank you for your time and attention.

Best regards

Wall