4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Hou Tao <hout...@huawei.com> commit 92e2921f7eee63450a5f953f4b15dc6210219430 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: 92abc475d8de ("jffs2: implement mount option parsing and compression overriding") Cc: sta...@kernel.org Signed-off-by: Hou Tao <hout...@huawei.com> Reviewed-by: Richard Weinberger <rich...@nod.at> Signed-off-by: Boris Brezillon <boris.brezil...@bootlin.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- fs/jffs2/super.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/fs/jffs2/super.c +++ b/fs/jffs2/super.c @@ -285,10 +285,8 @@ static int jffs2_fill_super(struct super 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 */