4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
commit bcdd0ca8cb8730573afebcaae4138f8f4c8eaa20 upstream.
syzbot is reporting crashes triggered by memory allocation fault injection
at tty_ldisc_get() [1]. As an attempt to handle OOM in a graceful way, we
have tried commit 5362544bebe85071 ("tty: don't panic on OOM in
tty_set_ldisc()"). But we reverted that attempt by commit a8983d01f9b7d600
("Revert "tty: don't panic on OOM in tty_set_ldisc()"") due to reproducible
crash. We should spend resource for finding and fixing race condition bugs
rather than complicate error paths for 2 * sizeof(void *) bytes allocation
failure.
[1]
https://syzkaller.appspot.com/bug?id=489d33fa386453859ead58ff5171d43772b13aa3
Signed-off-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Reported-by: syzbot <syzbot+40b7287c2dc987c48...@syzkaller.appspotmail.com>
Cc: Michal Hocko <mho...@suse.com>
Cc: Vegard Nossum <vegard.nos...@gmail.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: Jiri Slaby <jsl...@suse.com>
Cc: Peter Hurley <pe...@hurleysoftware.com>
Cc: One Thousand Gnomes <gno...@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/tty/tty_ldisc.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -168,12 +168,11 @@ static struct tty_ldisc *tty_ldisc_get(s
return ERR_CAST(ldops);
}
- ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL);
- if (ld == NULL) {
- put_ldops(ldops);
- return ERR_PTR(-ENOMEM);
- }
-
+ /*
+ * There is no way to handle allocation failure of only 16 bytes.
+ * Let's simplify error handling and save more memory.
+ */
+ ld = kmalloc(sizeof(struct tty_ldisc), GFP_KERNEL | __GFP_NOFAIL);
ld->ops = ldops;
ld->tty = tty;
