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authorHou Tao <houtao1@huawei.com>2018-10-06 12:09:35 +0300
committerBoris Brezillon <boris.brezillon@bootlin.com>2018-10-16 11:34:28 +0300
commit92e2921f7eee63450a5f953f4b15dc6210219430 (patch)
treee227bd50d9195d4826bd19e5c0df670933f3a5a3 /fs/jffs2
parent299b43535d3895bcde93cc7310b95b92b4fd8129 (diff)
downloadlinux-92e2921f7eee63450a5f953f4b15dc6210219430.tar.xz
jffs2: free jffs2_sb_info through jffs2_kill_sb()
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: 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>
Diffstat (limited to 'fs/jffs2')
-rw-r--r--fs/jffs2/super.c4
1 files changed, 1 insertions, 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 */