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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull vfs fixes from Al Viro:
 "Assorted fixes that sat in -next for a while, all over the place"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  aio: Fix locking in aio_poll()
  exec: Fix mem leak in kernel_read_file
  copy_mount_string: Limit string length to PATH_MAX
  cgroup: saner refcounting for cgroup_root
  fix cgroup_do_mount() handling of failure exits
This commit is contained in:
Linus Torvalds
2019-03-04 13:24:27 -08:00
parent 736706bee3 d3d6a18d7d
commit 4f9020ffde
7 changed files with 44 additions and 65 deletions
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12
fs/aio.c
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@@ -1666,6 +1666,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
struct poll_iocb *req = container_of(wait, struct poll_iocb, wait);
struct aio_kiocb *iocb = container_of(req, struct aio_kiocb, poll);
__poll_t mask = key_to_poll(key);
unsigned long flags;
req->woken = true;
@@ -1674,10 +1675,15 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
if (!(mask & req->events))
return 0;
/* try to complete the iocb inline if we can: */
if (spin_trylock(&iocb->ki_ctx->ctx_lock)) {
/*
* Try to complete the iocb inline if we can. Use
* irqsave/irqrestore because not all filesystems (e.g. fuse)
* call this function with IRQs disabled and because IRQs
* have to be disabled before ctx_lock is obtained.
*/
if (spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) {
list_del(&iocb->ki_list);
spin_unlock(&iocb->ki_ctx->ctx_lock);
spin_unlock_irqrestore(&iocb->ki_ctx->ctx_lock, flags);
list_del_init(&req->wait.entry);
aio_poll_complete(iocb, mask);