On Wed, Apr 21, 2021 at 03:20:12PM +0200, Christian König wrote:
> mmap_region() now calls fput() on the vma->vm_file.
>
> Fix this by using vma_set_file() so it doesn't need to be
> handled manually here any more.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> Fixes: 1527f926fd04 ("mm: mmap: fix fput in error path v2")
> CC: stable@xxxxxxxxxxxxxxx # 5.11+
> ---
> fs/overlayfs/file.c | 11 +----------
> 1 file changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
> index dbfb35fb0ff7..3847cdc069b5 100644
> --- a/fs/overlayfs/file.c
> +++ b/fs/overlayfs/file.c
> @@ -430,20 +430,11 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
> if (WARN_ON(file != vma->vm_file))
> return -EIO;
>
> - vma->vm_file = get_file(realfile);
> + vma_set_file(vma, realfile);
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
>
> old_cred = ovl_override_creds(file_inode(file)->i_sb);
> ret = call_mmap(vma->vm_file, vma);
> revert_creds(old_cred);
> -
> - if (ret) {
> - /* Drop reference count from new vm_file value */
> - fput(realfile);
> - } else {
> - /* Drop reference count from previous vm_file value */
> - fput(file);
> - }
> -
> ovl_file_accessed(file);
>
> return ret;
> --
> 2.25.1
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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