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scsi: scsi_debug: Fix possible UAF in sdebug_add_host_helper()

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[ Upstream commit e208a1d795 ]

If device_register() fails in sdebug_add_host_helper(), it will goto clean
and sdbg_host will be freed, but sdbg_host->host_list will not be removed
from sdebug_host_list, then list traversal may cause UAF. Fix it.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221117084421.58918-1-yuancan@huawei.com
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yuan Can 2022-11-17 08:44:21 +00:00 • committed by Justin Hammond
parent b779c369f8
commit b00d2fb46f
1 changed files with 5 additions and 1 deletions
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6
drivers/scsi/scsi_debug.c
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@ -7132,8 +7132,12 @@ static int sdebug_add_host_helper(int per_host_idx)
dev_set_name(&sdbg_host->dev, "adapter%d", sdebug_num_hosts);
error = device_register(&sdbg_host->dev);
if (error)
if (error) {
spin_lock(&sdebug_host_list_lock);
list_del(&sdbg_host->host_list);
spin_unlock(&sdebug_host_list_lock);
goto clean;
}
++sdebug_num_hosts;
return 0;