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Staging fixes for 4.16-rc6

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Here are 3 staging driver fixes for 4.16-rc6
 
 Two of them are lockdep fixes for the ashmem driver that have been
 reported by a number of people recently.  The last one is a fix for the
 comedi driver core.
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-4.16-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging fixes from Greg KH:
 "Here are three staging driver fixes for 4.16-rc6

  Two of them are lockdep fixes for the ashmem driver that have been
  reported by a number of people recently. The last one is a fix for the
  comedi driver core.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-4.16-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: android: ashmem: Fix possible deadlock in ashmem_ioctl
  staging: comedi: fix comedi_nsamples_left.
  staging: android: ashmem: Fix lockdep issue during llseek
This commit is contained in:
Linus Torvalds 2018-03-14 09:59:45 -07:00
commit 5e15d39f1e
2 changed files with 11 additions and 15 deletions
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23
drivers/staging/android/ashmem.c
View File

@ -326,24 +326,23 @@ static loff_t ashmem_llseek(struct file *file, loff_t offset, int origin)
mutex_lock(&ashmem_mutex);
if (asma->size == 0) {
ret = -EINVAL;
goto out;
mutex_unlock(&ashmem_mutex);
return -EINVAL;
}
if (!asma->file) {
ret = -EBADF;
goto out;
mutex_unlock(&ashmem_mutex);
return -EBADF;
}
mutex_unlock(&ashmem_mutex);
ret = vfs_llseek(asma->file, offset, origin);
if (ret < 0)
goto out;
return ret;
/** Copy f_pos from backing file, since f_ops->llseek() sets it */
file->f_pos = asma->file->f_pos;
out:
mutex_unlock(&ashmem_mutex);
return ret;
}
@ -702,16 +701,14 @@ static int ashmem_pin_unpin(struct ashmem_area *asma, unsigned long cmd,
size_t pgstart, pgend;
int ret = -EINVAL;
if (unlikely(copy_from_user(&pin, p, sizeof(pin))))
return -EFAULT;
mutex_lock(&ashmem_mutex);
if (unlikely(!asma->file))
goto out_unlock;
if (unlikely(copy_from_user(&pin, p, sizeof(pin)))) {
ret = -EFAULT;
goto out_unlock;
}
/* per custom, you can pass zero for len to mean "everything onward" */
if (!pin.len)
pin.len = PAGE_ALIGN(asma->size) - pin.offset;

3
drivers/staging/comedi/drivers.c
View File

@ -475,8 +475,7 @@ unsigned int comedi_nsamples_left(struct comedi_subdevice *s,
struct comedi_cmd *cmd = &async->cmd;
if (cmd->stop_src == TRIG_COUNT) {
unsigned int nscans = nsamples / cmd->scan_end_arg;
unsigned int scans_left = __comedi_nscans_left(s, nscans);
unsigned int scans_left = __comedi_nscans_left(s, cmd->stop_arg);
unsigned int scan_pos =
comedi_bytes_to_samples(s, async->scan_progress);
unsigned long long samples_left = 0;