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Make sure the VMAP's "vm_file" field is referenced in a Linux

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compatible way by the linux_dev_mmap_single() function in the
LinuxKPI.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2017-05-31 13:07:05 +00:00
parent cca15f28c5
commit d56f1ed887
1 changed files with 5 additions and 1 deletions
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6
sys/compat/linuxkpi/common/src/linux_compat.c
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@ -489,6 +489,10 @@ static TAILQ_HEAD(, vm_area_struct) linux_vma_head =
static void
linux_cdev_handle_free(struct vm_area_struct *vmap)
{
/* Drop reference on vm_file */
if (vmap->vm_file != NULL)
fput(vmap->vm_file);
/* Drop reference on mm_struct */
mmput(vmap->vm_mm);
@ -931,7 +935,7 @@ linux_dev_mmap_single(struct cdev *dev, vm_ooffset_t *offset,
vmap->vm_pfn = 0;
vmap->vm_flags = vmap->vm_page_prot = nprot;
vmap->vm_ops = NULL;
vmap->vm_file = filp;
vmap->vm_file = get_file(filp);
vmap->vm_mm = mm;
if (unlikely(down_write_killable(&vmap->vm_mm->mmap_sem))) {