linux-kernel - Re: [PATCH v3] mm/hugetlb: Fix incorrect error return from hugetlb_reserve

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Message-ID: <aScKenEARH_rOzW2@localhost.localdomain>
Date: Wed, 26 Nov 2025 15:11:06 +0100
From: Oscar Salvador <osalvador@...e.de>
To: Shameer Kolothum <skolothumtho@...dia.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, muchun.song@...ux.dev,
	vivek.kasireddy@...el.com, joshua.hahnjy@...il.com, jgg@...dia.com,
	nicolinc@...dia.com, nathanc@...dia.com, mochs@...dia.com
Subject: Re: [PATCH v3] mm/hugetlb: Fix incorrect error return from
 hugetlb_reserve_pages()

On Tue, Nov 25, 2025 at 05:13:50PM +0000, Shameer Kolothum wrote:
> The function hugetlb_reserve_pages() returns the number of pages added
> to the reservation map on success and a negative error code on failure
> (e.g. -EINVAL, -ENOMEM). However, in some error paths, it may return -1
> directly.
> 
> For example, a failure at:
> 
>     if (hugetlb_acct_memory(h, gbl_reserve) < 0)
>         goto out_put_pages;
> 
> results in returning -1 (since add = -1), which may be misinterpreted
> in userspace as -EPERM.
> 
> Fix this by explicitly capturing and propagating the return values from
> helper functions, and using -EINVAL for all other failure cases.
> 
> Fixes: 986f5f2b4be3 ("mm/hugetlb: make hugetlb_reserve_pages() return nr of entries updated")
> Reviewed-by: Joshua Hahn <joshua.hahnjy@...il.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Shameer Kolothum <skolothumtho@...dia.com>

Acked-by: Oscar Salvador <osalvador@...e.de>


-- 
Oscar Salvador
SUSE Labs