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Date: Tue, 25 Aug 2020 12:48:04 -0400 From: Peilin Ye <yepeilin.cs@...il.com> To: jslaby@...e.cz Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, syzkaller-bugs@...glegroups.com, linux-kernel-mentees@...ts.linuxfoundation.org Subject: Re: [PATCH 15/16] vc_screen: extract vcs_read_buf_header Hi all, Link: https://syzkaller.appspot.com/bug?id=f332576321998d36cd07d09c9c1268cfed1895c9 As reported by syzbot, vcs_read_buf() is overflowing `con_buf16`, since this patch removed the following check: - if (count > CON_BUF_SIZE) { - count = CON_BUF_SIZE; - filled = count - pos; - } Decreasing `count` by `min(HEADER_SIZE - pos, count)` bypasses this check. Additionally, this patch also removed updates to `skip` and `filled`. What should we do in order to fix it? Thank you, Peilin Ye
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