linux-kernel - Re: [ocfs2?] kernel BUG in ocfs2_truncate

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Message-ID: <tencent_11642C456F589720E8CEEC46CD2879666E0A@qq.com>
Date: Wed,  9 Oct 2024 17:00:03 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+81092778aac03460d6b7@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [ocfs2?] kernel BUG in ocfs2_truncate_inline

offset or offset + len greater than UINT_MAX, if true, it will overflow in ocfs2_truncate_inline

#syz test

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ad131a2fc58e..ed26ec8ac6b6 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2117,6 +2117,9 @@ static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
 			return ret;
 	}
 
+	if (offset > UINT_MAX || offset + len > UINT_MAX)
+		return -EFBIG;
+
 	if (mode & FALLOC_FL_PUNCH_HOLE)
 		cmd = OCFS2_IOC_UNRESVSP64;