[PATCH 3.18 57/85] fuse: dont keep dead fuse_conn at fuse_fill_super().

From: Greg Kroah-Hartman
Date: Sun Jul 01 2018 - 14:39:07 EST

3.18-stable review patch. If anyone has any objections, please let me know.


From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>

commit 543b8f8662fe6d21f19958b666ab0051af9db21a upstream.

syzbot is reporting use-after-free at fuse_kill_sb_blk() [1].
Since sb->s_fs_info field is not cleared after fc was released by
fuse_conn_put() when initialization failed, fuse_kill_sb_blk() finds
already released fc and tries to hold the lock. Fix this by clearing
sb->s_fs_info field after calling fuse_conn_put().

[1] https://syzkaller.appspot.com/bug?id=a07a680ed0a9290585ca424546860464dd9658db

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Reported-by: syzbot <syzbot+ec3986119086fe4eec97@xxxxxxxxxxxxxxxxxxxxxxxxx>
Fixes: 3b463ae0c626 ("fuse: invalidation reverse calls")
Cc: John Muir <john@xxxxxxxxx>
Cc: Csaba Henk <csaba@xxxxxxxxxxx>
Cc: Anand Avati <avati@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v2.6.31
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/fuse/inode.c | 1 +
1 file changed, 1 insertion(+)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1125,6 +1125,7 @@ static int fuse_fill_super(struct super_
+ sb->s_fs_info = NULL;