linux-kernel - Re: [syzbot] [exfat?] kernel BUG in iov_iter

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_A4341BF325BBBA35BBFA336B9E701B144B08@qq.com>
Date: Fri, 19 Jan 2024 21:10:40 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+fd404f6b03a58e8bc403@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [exfat?] kernel BUG in iov_iter_revert

please test kernel BUG in iov_iter_revert

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 522edcbb2ce4..af8870145f67 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -534,7 +534,8 @@ static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 		size = pos + ret;
 
 	/* zero the unwritten part in the partially written block */
-	if (rw == READ && pos < ei->valid_size && ei->valid_size < size) {
+	if (ret == -EIOCBQUEUED && rw == READ && pos < ei->valid_size && 
+			ei->valid_size < size) {
 		iov_iter_revert(iter, size - ei->valid_size);
 		iov_iter_zero(size - ei->valid_size, iter);
 	}