From e2a87785aab0dac190ac89be6a9ba955e2c634f2 Mon Sep 17 00:00:00 2001
From: Gaosheng Cui <cuigaosheng1@huawei.com>
Date: Thu, 17 Nov 2022 11:44:23 +0800
Subject: [PATCH] hwmon: (ibmpex) Fix possible UAF when ibmpex_register_bmc() fails
Git-commit: e2a87785aab0dac190ac89be6a9ba955e2c634f2
Patch-mainline: v6.1-rc8
References: git-fixes
Smatch report warning as follows:
drivers/hwmon/ibmpex.c:509 ibmpex_register_bmc() warn:
'&data->list' not removed from list
If ibmpex_find_sensors() fails in ibmpex_register_bmc(), data will
be freed, but data->list will not be removed from driver_data.bmc_data,
then list traversal may cause UAF.
Fix by removeing it from driver_data.bmc_data before free().
Fixes: 57c7c3a0fdea ("hwmon: IBM power meter driver")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20221117034423.2935739-1-cuigaosheng1@huawei.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/hwmon/ibmpex.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c
index f6ec165c0fa8..1837cccd993c 100644
--- a/drivers/hwmon/ibmpex.c
+++ b/drivers/hwmon/ibmpex.c
@@ -502,6 +502,7 @@ static void ibmpex_register_bmc(int iface, struct device *dev)
return;
out_register:
+ list_del(&data->list);
hwmon_device_unregister(data->hwmon_dev);
out_user:
ipmi_destroy_user(data->user);
--
2.35.3