From 1108b0f4920decba745e4f4df21d679bb61dce48 Mon Sep 17 00:00:00 2001 From: Qinglang Miao Date: Fri, 20 Nov 2020 15:48:47 +0800 Subject: [PATCH] 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 Signed-off-by: Qinglang Miao Acked-by: Serge Semin Signed-off-by: Thomas Bogendoerfer Signed-off-by: Sasha Levin --- drivers/bus/mips_cdmm.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c index 9f7ed1fcd428..626dedd110cb 100644 --- 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); - } } }