mips: cdmm: fix use-after-free in mips_cdmm_bus_discover

[ Upstream commit f0e82242b16826077a2775eacfe201d803bb7a22 ]

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@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c
index 9f7ed1f..626dedd 100644 (file)
--- a/drivers/bus/mips_cdmm.c
+++ b/drivers/bus/mips_cdmm.c
@@ -559,10 +559,8 @@ static void mips_cdmm_bus_discover(struct mips_cdmm_bus *bus)
                dev_set_name(&dev->dev, "cdmm%u-%u", cpu, id);
                ++id;
                ret = device_register(&dev->dev);
-               if (ret) {
+               if (ret)
                        put_device(&dev->dev);
-                       kfree(dev);
-               }
        }
 }