From: Hou Tao <houtao1@huawei.com>
To: <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Cc: <dwmw2@infradead.org>, <stable@kernel.org>
Subject: [PATCH] jffs2: free jffs2_sb_info through jffs2_kill_sb()
Date: Sat, 6 Oct 2018 17:09:35 +0800 [thread overview]
Message-ID: <20181006090935.41714-1-houtao1@huawei.com> (raw)
When an invalid mount option is passed to jffs2, jffs2_parse_options()
will fail and jffs2_sb_info will be freed, but then jffs2_sb_info will
be used (use-after-free) and freeed (double-free) in jffs2_kill_sb().
Fix it by removing the buggy invocation of kfree() when getting invalid
mount options.
Cc: stable@kernel.org
Signed-off-by: Hou Tao <houtao1@huawei.com>
---
fs/jffs2/super.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 87bdf0f4cba1..902a7dd10e5c 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -285,10 +285,8 @@ static int jffs2_fill_super(struct super_block *sb, void *data, int silent)
sb->s_fs_info = c;
ret = jffs2_parse_options(c, data);
- if (ret) {
- kfree(c);
+ if (ret)
return -EINVAL;
- }
/* Initialize JFFS2 superblock locks, the further initialization will
* be done later */
--
2.16.2.dirty
next reply other threads:[~2018-10-06 9:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-06 9:09 Hou Tao [this message]
2018-10-16 5:52 ` [PATCH] jffs2: free jffs2_sb_info through jffs2_kill_sb() Hou Tao
2018-10-16 6:41 ` Richard Weinberger
2018-10-16 10:26 ` Hou Tao
2018-10-16 11:49 ` Boris Brezillon
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