linux-kernel - Re: [syzbot] [jfs?] kernel BUG in jfs_truncate

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Message-ID: <tencent_F2697FA3B36447577E176326C65365E37905@qq.com>
Date: Wed,  4 Jun 2025 14:13:47 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+630f6d40b3ccabc8e96e@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] kernel BUG in jfs_truncate_nolock

#syz test

diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index 01b6912e60f8..742cadd1f37e 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -44,6 +44,9 @@ static int jfs_open(struct inode *inode, struct file *file)
 {
 	int rc;
 
+	if (S_ISREG(inode->i_mode) && inode->i_size < 0)
+		return -EIO;
+
 	if ((rc = dquot_file_open(inode, file)))
 		return rc;