linux-kernel - [PATCH AUTOSEL 5.4 2/5] nbd: Add the maximum limit of allocated index in nbd_dev

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Message-Id: <20230702194209.1779267-2-sashal@kernel.org>
Date:   Sun,  2 Jul 2023 15:42:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhong Jinghua <zhongjinghua@...wei.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>, josef@...icpanda.com,
        linux-block@...r.kernel.org, nbd@...er.debian.org
Subject: [PATCH AUTOSEL 5.4 2/5] nbd: Add the maximum limit of allocated index in nbd_dev_add

From: Zhong Jinghua <zhongjinghua@...wei.com>

[ Upstream commit f12bc113ce904777fd6ca003b473b427782b3dde ]

If the index allocated by idr_alloc greater than MINORMASK >> part_shift,
the device number will overflow, resulting in failure to create a block
device.

Fix it by imiting the size of the max allocation.

Signed-off-by: Zhong Jinghua <zhongjinghua@...wei.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20230605122159.2134384-1-zhongjinghua@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/nbd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 218aa7e419700..37994a7a1b6f4 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -1708,7 +1708,8 @@ static int nbd_dev_add(int index)
 		if (err == -ENOSPC)
 			err = -EEXIST;
 	} else {
-		err = idr_alloc(&nbd_index_idr, nbd, 0, 0, GFP_KERNEL);
+		err = idr_alloc(&nbd_index_idr, nbd, 0,
+				(MINORMASK >> part_shift) + 1, GFP_KERNEL);
 		if (err >= 0)
 			index = err;
 	}
-- 
2.39.2