linux-kernel - [PATCH] rtc: nvmem: fix possible use after free

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Message-Id: <20181230235553.31266-1-alexandre.belloni@bootlin.com>
Date:   Mon, 31 Dec 2018 00:55:53 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     linux-rtc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] rtc: nvmem: fix possible use after free

In cas of probe failure, devres may free the memory allocated for
rtc->nvram before devm_rtc_release_device() is called. This leads to
rtc_nvram_unregister using it after being freed which may lead to a crash.

This has been shown to happen after commit 461e557b9727 ("rtc: nvmem: use
devm_nvmem_register()")

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/nvmem.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
index ebdfe8e3a1a0..dce518d5e50e 100644
--- a/drivers/rtc/nvmem.c
+++ b/drivers/rtc/nvmem.c
@@ -12,6 +12,7 @@
 #include <linux/types.h>
 #include <linux/nvmem-consumer.h>
 #include <linux/rtc.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 
 /*
@@ -45,9 +46,7 @@ static int rtc_nvram_register(struct rtc_device *rtc,
 {
 	int err;
 
-	rtc->nvram = devm_kzalloc(rtc->dev.parent,
-				sizeof(struct bin_attribute),
-				GFP_KERNEL);
+	rtc->nvram = kzalloc(sizeof(struct bin_attribute), GFP_KERNEL);
 	if (!rtc->nvram)
 		return -ENOMEM;
 
@@ -64,7 +63,7 @@ static int rtc_nvram_register(struct rtc_device *rtc,
 	err = sysfs_create_bin_file(&rtc->dev.parent->kobj,
 				    rtc->nvram);
 	if (err) {
-		devm_kfree(rtc->dev.parent, rtc->nvram);
+		kfree(rtc->nvram);
 		rtc->nvram = NULL;
 	}
 
@@ -74,6 +73,8 @@ static int rtc_nvram_register(struct rtc_device *rtc,
 static void rtc_nvram_unregister(struct rtc_device *rtc)
 {
 	sysfs_remove_bin_file(&rtc->dev.parent->kobj, rtc->nvram);
+	kfree(rtc->nvram);
+	rtc->nvram = NULL;
 }
 
 /*
-- 
2.20.1