linux-kernel - [PATCH] jfs: Regular file curruption check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tencent_35CC9554E896EE32CDD479766DB42D056D0A@qq.com>
Date: Wed,  4 Jun 2025 14:48:43 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+630f6d40b3ccabc8e96e@...kaller.appspotmail.com
Cc: jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] jfs: Regular file curruption check

The reproducer builds a corrupted file on disk with a negative i_size value.
Add a check when opening this file to avoid subsequent operation failures.

Reported-by: syzbot+630f6d40b3ccabc8e96e@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=630f6d40b3ccabc8e96e
Tested-by: syzbot+630f6d40b3ccabc8e96e@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 fs/jfs/file.c | 3 +++
 1 file changed, 3 insertions(+)

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;
 
-- 
2.43.0