devpts: fix error handling in devpts_mntget()

If devpts_ptmx_path() returns an error code, then devpts_mntget()
dereferences an ERR_PTR():

    BUG: unable to handle kernel paging request at fffffffffffffff5
    IP: devpts_mntget+0x13f/0x280 fs/devpts/inode.c:173

Fix it by returning early in the error paths.

Reproducer:

    #define _GNU_SOURCE
    #include <fcntl.h>
    #include <sched.h>
    #include <sys/ioctl.h>
    #define TIOCGPTPEER _IO('T', 0x41)

    int main()
    {
        for (;;) {
            int fd = open("/dev/ptmx", 0);
            unshare(CLONE_NEWNS);
            ioctl(fd, TIOCGPTPEER, 0);
        }
    }

Fixes: 311fc65c9fb9 ("pty: Repair TIOCGPTPEER")
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: <stable@vger.kernel.org> # v4.13+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 7eae33ffa3fcc1d709790b79225521472c6f8281..e31d6ed3ec3275dcae2b5362f562ecdb43d54bcd 100644 (file)
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -168,11 +168,11 @@ struct vfsmount *devpts_mntget(struct file *filp, struct pts_fs_info *fsi)
        dput(path.dentry);
        if (err) {
                mntput(path.mnt);
-               path.mnt = ERR_PTR(err);
+               return ERR_PTR(err);
        }
        if (DEVPTS_SB(path.mnt->mnt_sb) != fsi) {
                mntput(path.mnt);
-               path.mnt = ERR_PTR(-ENODEV);
+               return ERR_PTR(-ENODEV);
        }
        return path.mnt;
 }