Re: [PATCH] watch_queue: fix IOC_WATCH_QUEUE_SET_SIZE alloc error paths

[David Disseldorp <ddiss@suse.de>]

Hi David,

Any feedback on this? It's a pretty obvious fix IMO.

On Mon, 28 Mar 2022 16:57:46 +0200, David Disseldorp wrote:

> From code inspection, the watch_queue_set_size() allocation error paths
> return the ret value set via the prior pipe_resize_ring() call, which
> will always be zero.
> 
> Fixes: c73be61cede58 ("pipe: Add general notification queue support")
> Signed-off-by: David Disseldorp <ddiss@suse.de>
> ---
>  kernel/watch_queue.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c
> index 3990e4df3d7b0..a128dedec9db2 100644
> --- a/kernel/watch_queue.c
> +++ b/kernel/watch_queue.c
> @@ -248,6 +248,7 @@ long watch_queue_set_size(struct pipe_inode_info *pipe, unsigned int nr_notes)
>  	if (ret < 0)
>  		goto error;
>  
> +	ret = -ENOMEM;
>  	pages = kcalloc(sizeof(struct page *), nr_pages, GFP_KERNEL);
>  	if (!pages)
>  		goto error;