linux-kernel - [PATCH] mm/page_alloc: Fix __alloc_size attribute for alloc_pages_exact

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Date:   Tue, 14 Dec 2021 17:21:23 +0100
From:   Thibaut Sautereau <thibaut.sautereau@...p-os.org>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Daniel Micay <danielmicay@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Levente Polyak <levente@...entepolyak.net>,
        Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
Subject: [PATCH] mm/page_alloc: Fix __alloc_size attribute for
 alloc_pages_exact_nid

From: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>

The second parameter of alloc_pages_exact_nid is the one indicating the
size of memory pointed by the returned pointer.

Fixes: abd58f38dfb4 ("mm/page_alloc: add __alloc_size attributes for better bounds checking")
Cc: Daniel Micay <danielmicay@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Levente Polyak <levente@...entepolyak.net>
Signed-off-by: Thibaut Sautereau <thibaut.sautereau@....gouv.fr>
---
 include/linux/gfp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index b976c4177299..8fcc38467af6 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -624,7 +624,7 @@ extern unsigned long get_zeroed_page(gfp_t gfp_mask);
 
 void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1);
 void free_pages_exact(void *virt, size_t size);
-__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(1);
+__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2);
 
 #define __get_free_page(gfp_mask) \
 		__get_free_pages((gfp_mask), 0)
-- 
2.34.1