linux-kernel - Re: [syzbot] [bfs?] general protection fault in bfs_get

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_357089BF2EF46ECD4C8DE7DF46F312CDC606@qq.com>
Date: Sun,  3 Nov 2024 14:08:10 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f51a2a34984e4d8888fd@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bfs?] general protection fault in bfs_get_block (3)

add a check for new bh 

#syz test

diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index fa66a09e496a..5fb6428d692d 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -40,6 +40,11 @@ static int bfs_move_block(unsigned long from, unsigned long to,
 	if (!bh)
 		return -EIO;
 	new = sb_getblk(sb, to);
+	if (!new || !buffer_uptodate(new)) {
+		bforget(bh);
+		return -ENOMEM;
+	}
+
 	memcpy(new->b_data, bh->b_data, bh->b_size);
 	mark_buffer_dirty(new);
 	bforget(bh);