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jffs2: free jffs2_sb_info through jffs2_kill_sb()

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commit 92e2921f7e upstream.

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.

Fixes: 92abc475d8 ("jffs2: implement mount option parsing and compression overriding")
Cc: stable@kernel.org
Signed-off-by: Hou Tao <houtao1@huawei.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hou Tao 2018-10-06 17:09:35 +08:00 committed by Greg Kroah-Hartman
parent dff53cf71a
commit 85b89ccf86
1 changed files with 1 additions and 3 deletions
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4
fs/jffs2/super.c
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@ -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 */