Re: [PATCH 1/2] coda: fix reference counting in coda_file_mmap error path

[Daniel Vetter]

On Wed, Apr 21, 2021 at 03:20:11PM +0200, Christian König wrote:
> mmap_region() now calls fput() on the vma->vm_file.
> 
> So we need to drop the extra reference on the coda file instead of the
> host file.
> 
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> Fixes: 1527f926fd04 ("mm: mmap: fix fput in error path v2")
> CC: stable@xxxxxxxxxxxxxxx # 5.11+

Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
>  fs/coda/file.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/coda/file.c b/fs/coda/file.c
> index 128d63df5bfb..ef5ca22bfb3e 100644
> --- a/fs/coda/file.c
> +++ b/fs/coda/file.c
> @@ -175,10 +175,10 @@ coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma)
>  	ret = call_mmap(vma->vm_file, vma);
>  
>  	if (ret) {
> -		/* if call_mmap fails, our caller will put coda_file so we
> -		 * should drop the reference to the host_file that we got.
> +		/* if call_mmap fails, our caller will put host_file so we
> +		 * should drop the reference to the coda_file that we got.
>  		 */
> -		fput(host_file);
> +		fput(coda_file);
>  		kfree(cvm_ops);
>  	} else {
>  		/* here we add redirects for the open/close vm_operations */
> -- 
> 2.25.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch