From: Yuan Can <yuancan@xxxxxxxxxx>
[ Upstream commit e208a1d795a08d1ac0398c79ad9c58106531bcc5 ]
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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Yuan Can <yuancan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221117084421.58918-1-yuancan@xxxxxxxxxx
Acked-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/scsi/scsi_debug.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 747e1cbb7ec9..2b5e249f5d5b 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -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;
--
2.35.1
