On Thu, Apr 13, 2017 at 3:50 AM, Vegard Nossum <vegard.nossum@xxxxxxxxx> wrote:
>
> I've bisected a syzkaller crash down to this commit
> (5362544bebe85071188dd9e479b5a5040841c895). The crash is:
>
> [ 25.137552] BUG: unable to handle kernel paging request at 0000000000002280
> [ 25.137579] IP: mutex_lock_interruptible+0xb/0x30
It would seem to be the
if (mutex_lock_interruptible(&ldata->atomic_read_lock))
call in n_tty_read(), the offset is about right for a NULL 'ldata'
pointer (it's a big structure, it has a couple of character buffers of
size N_TTY_BUF_SIZE).
I don't see the obvious fix, so I suspect at this point we should just
revert, as that commit seems to introduce worse problems that it is
supposed to fix. Greg?
Linus
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