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: sta...@kernel.org Signed-off-by: Hou Tao <hout...@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