linux-kernel - [PATCH 4.14 142/146] lib/test_kmod.c: fix rmmod double free

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Message-Id: <20181204103732.536311320@linuxfoundation.org>
Date:   Tue,  4 Dec 2018 11:50:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.14 142/146] lib/test_kmod.c: fix rmmod double free

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Luis Chamberlain <mcgrof@...nel.org>

commit 5618cf031fecda63847cafd1091e7b8bd626cdb1 upstream.

We free the misc device string twice on rmmod; fix this.  Without this
we cannot remove the module without crashing.

Link: http://lkml.kernel.org/r/20181124050500.5257-1-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Reviewed-by: Andrew Morton <akpm@...ux-foundation.org>
Cc: <stable@...r.kernel.org>	[4.12+]
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/test_kmod.c |    1 -
 1 file changed, 1 deletion(-)

--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -1221,7 +1221,6 @@ void unregister_test_dev_kmod(struct kmo
 
 	dev_info(test_dev->dev, "removing interface\n");
 	misc_deregister(&test_dev->misc_dev);
-	kfree(&test_dev->misc_dev.name);
 
 	mutex_unlock(&test_dev->config_mutex);
 	mutex_unlock(&test_dev->trigger_mutex);