linux-kernel - [PATCH] mips: cdmm: fix use-after-free in mips_cdmm_bus

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Message-ID: <20201120074847.31369-1-miaoqinglang@huawei.com>
Date:   Fri, 20 Nov 2020 15:48:47 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Serge Semin <fancer.lancer@...il.com>
CC:     <linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Qinglang Miao" <miaoqinglang@...wei.com>
Subject: [PATCH] mips: cdmm: fix use-after-free in mips_cdmm_bus_discover

kfree(dev) has been called inside put_device so anther
kfree would cause a use-after-free bug/

Fixes: 8286ae03308c ("MIPS: Add CDMM bus support")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
 drivers/bus/mips_cdmm.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c
index 9f7ed1fcd..e43786c67 100644
--- a/drivers/bus/mips_cdmm.c
+++ b/drivers/bus/mips_cdmm.c
@@ -561,7 +561,6 @@ static void mips_cdmm_bus_discover(struct mips_cdmm_bus *bus)
 		ret = device_register(&dev->dev);
 		if (ret) {
 			put_device(&dev->dev);
-			kfree(dev);
 		}
 	}
 }
-- 
2.23.0