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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-23 22:05:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-23 22:05:10 +0100 |
| commit | 5617c05d44ebd7b75973b5b31a9f2e55e5882d3f (patch) | |
| tree | 7250f4b5690c141115a13afdb21c12cc720ae79c /kernel/futex.c | |
| parent | 22db87ba6bbefcb12493ae9c7be2037f5f12639d (diff) | |
| parent | 25cd9721c2b16ee0d775e36ec3af31f392003f80 (diff) | |
| download | blackbird-obmc-linux-5617c05d44ebd7b75973b5b31a9f2e55e5882d3f.tar.gz blackbird-obmc-linux-5617c05d44ebd7b75973b5b31a9f2e55e5882d3f.zip | |
Merge tag 'fixes-for-v4.11-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-linus
Felipe writes:
usb: fixes for v4.11-rc4
f_acm got an endianness fix by Oliver Neukum. This has been around for a
long time but it's finally fixed.
f_hid learned that it should never access hidg->req without first
grabbing the spinlock.
Roger Quadros fixed two bugs in the f_uvc function driver.
Janusz Dziedzic fixed a very peculiar bug with EP0, one that's rather
difficult to trigger. When we're dealing with bounced EP0 requests, we
should delay unmap until after ->complete() is called.
UDC class got a use-after-free fix.
Diffstat (limited to 'kernel/futex.c')
| -rw-r--r-- | kernel/futex.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 229a744b1781..45858ec73941 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -2815,7 +2815,6 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, { struct hrtimer_sleeper timeout, *to = NULL; struct rt_mutex_waiter rt_waiter; - struct rt_mutex *pi_mutex = NULL; struct futex_hash_bucket *hb; union futex_key key2 = FUTEX_KEY_INIT; struct futex_q q = futex_q_init; @@ -2899,6 +2898,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, if (q.pi_state && (q.pi_state->owner != current)) { spin_lock(q.lock_ptr); ret = fixup_pi_state_owner(uaddr2, &q, current); + if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current) + rt_mutex_unlock(&q.pi_state->pi_mutex); /* * Drop the reference to the pi state which * the requeue_pi() code acquired for us. @@ -2907,6 +2908,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, spin_unlock(q.lock_ptr); } } else { + struct rt_mutex *pi_mutex; + /* * We have been woken up by futex_unlock_pi(), a timeout, or a * signal. futex_unlock_pi() will not destroy the lock_ptr nor @@ -2930,18 +2933,19 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags, if (res) ret = (res < 0) ? res : 0; + /* + * If fixup_pi_state_owner() faulted and was unable to handle + * the fault, unlock the rt_mutex and return the fault to + * userspace. + */ + if (ret && rt_mutex_owner(pi_mutex) == current) + rt_mutex_unlock(pi_mutex); + /* Unqueue and drop the lock. */ unqueue_me_pi(&q); } - /* - * If fixup_pi_state_owner() faulted and was unable to handle the - * fault, unlock the rt_mutex and return the fault to userspace. - */ - if (ret == -EFAULT) { - if (pi_mutex && rt_mutex_owner(pi_mutex) == current) - rt_mutex_unlock(pi_mutex); - } else if (ret == -EINTR) { + if (ret == -EINTR) { /* * We've already been requeued, but cannot restart by calling * futex_lock_pi() directly. We could restart this syscall, but |
