linux-kernel - [PATCH 1/1] module: Fix dangling pointer after kfree()

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Date:	Mon, 14 Nov 2011 18:58:08 -0700
From:	Dominic Chen <d.c.ddcc@...il.com>
To:	linux-kernel@...r.kernel.org
CC:	rusty@...tcorp.com.au
Subject: [PATCH 1/1] module: Fix dangling pointer after kfree()

remove_notes_attrs() calls free_notes_attrs(), which in turn calls
kfree() on mod->notes_attrs, but fails to set this dangling pointer to
NULL. This differs from both module_param_sysfs_remove() and
remove_sect_attrs(), which set the pointers to NULL after calling kfree().

Signed-off-by: Dominic Chen <d.c.ddcc@...il.com>
---
 kernel/module.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 178333c..9ca0923 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1380,8 +1380,10 @@ static void add_notes_attrs(struct module *mod,
const struct load_info *info)

 static void remove_notes_attrs(struct module *mod)
 {
-	if (mod->notes_attrs)
+	if (mod->notes_attrs) {
 		free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
+		mod->notes_attrs = NULL;
+	}
 }

 #else
-- 
1.7.5.4
--
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