From: Anant Thazhemadam <anant.thazhemadam@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-kernel-mentees@lists.linuxfoundation.org,
Anant Thazhemadam <anant.thazhemadam@gmail.com>,
syzbot+4191a44ad556eacc1a7a@syzkaller.appspotmail.com,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] fs: fix KMSAN uninit-value bug by initializing nd in do_file_open_root
Date: Wed, 16 Sep 2020 10:56:56 +0530 [thread overview]
Message-ID: <20200916052657.18683-1-anant.thazhemadam@gmail.com> (raw)
The KMSAN bug report for the bug indicates that there exists;
Local variable ----nd@do_file_open_root created at:
do_file_open_root+0xa4/0xb40 fs/namei.c:3385
do_file_open_root+0xa4/0xb40 fs/namei.c:3385
Initializing nd fixes this issue, and doesn't break anything else either
Fixes: https://syzkaller.appspot.com/bug?extid=4191a44ad556eacc1a7a
Reported-by: syzbot+4191a44ad556eacc1a7a@syzkaller.appspotmail.com
Tested-by: syzbot+4191a44ad556eacc1a7a@syzkaller.appspotmail.com
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
fs/namei.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/namei.c b/fs/namei.c
index e99e2a9da0f7..b27382586209 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3404,7 +3404,7 @@ struct file *do_filp_open(int dfd, struct filename *pathname,
struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
const char *name, const struct open_flags *op)
{
- struct nameidata nd;
+ struct nameidata nd = {};
struct file *file;
struct filename *filename;
int flags = op->lookup_flags | LOOKUP_ROOT;
--
2.25.1
next reply other threads:[~2020-09-16 5:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 5:26 Anant Thazhemadam [this message]
2020-09-16 5:41 ` [PATCH] fs: fix KMSAN uninit-value bug by initializing nd in do_file_open_root Eric Biggers
2020-09-17 0:22 ` Al Viro
2020-09-19 14:44 ` [Linux-kernel-mentees] " Greg KH
2020-09-19 16:17 ` Al Viro
2020-09-19 16:55 ` Al Viro
2020-09-19 11:33 ` Anant Thazhemadam
2020-09-19 20:17 ` Anant Thazhemadam
2020-10-04 15:25 ` Anant Thazhemadam
2020-09-16 6:16 ` Greg KH
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