linux-kernel - [PATCH] block: nbd: fix sanity check for first

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-next>] [day] [month] [year] [list]

Message-Id: <20211009053540.95100-1-ukernel@gmail.com>
Date:   Sat,  9 Oct 2021 13:35:40 +0800
From:   "Yan, Zheng" <ukernel@...il.com>
To:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     axboe@...nel.dk, paskripkin@...il.com,
        "Yan, Zheng" <yanzheng03@...ishou.com>
Subject: [PATCH] block: nbd: fix sanity check for first_minor

From: "Yan, Zheng" <yanzheng03@...ishou.com>

Device's minor is a 20-bits number, max value is 0xfffff.

Fixes: b1a811633f ("block: nbd: add sanity check for first_minor").
Signed-off-by: "Yan, Zheng" <yanzheng03@...ishou.com>
---
 drivers/block/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 1183f7872b71..53cd038c96e9 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1753,7 +1753,7 @@ static struct nbd_device *nbd_dev_add(int index, unsigned int refs)
 	 * byte in __device_add_disk().
 	 */
 	disk->first_minor = index << part_shift;
-	if (disk->first_minor > 0xff) {
+	if (disk->first_minor > MINORMASK) {
 		err = -EINVAL;
 		goto out_free_idr;
 	}
-- 
2.12.2