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From: Kees Cook <keescook@chromium.org>
To: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Kees Cook <keescook@chromium.org>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	kernel-hardening@lists.openwall.com
Subject: [PATCH 07/13] treewide: Use struct_size() for vmalloc()-family
Date: Tue,  8 May 2018 17:42:23 -0700	[thread overview]
Message-ID: <20180509004229.36341-8-keescook@chromium.org> (raw)
In-Reply-To: <20180509004229.36341-1-keescook@chromium.org>

This only finds one hit in the entire tree, but here's the Coccinelle:

// Directly refer to structure's field
@@
identifier alloc =~ "vmalloc|vzalloc";
identifier VAR, ELEMENT;
expression COUNT;
@@

- alloc(sizeof(*VAR) + COUNT * sizeof(*VAR->ELEMENT))
+ alloc(struct_size(VAR, ELEMENT, COUNT))

// mr = kzalloc(sizeof(*mr) + m * sizeof(mr->map[0]), GFP_KERNEL);
@@
identifier alloc =~ "vmalloc|vzalloc";
identifier VAR, ELEMENT;
expression COUNT;
@@

- alloc(sizeof(*VAR) + COUNT * sizeof(VAR->ELEMENT[0]))
+ alloc(struct_size(VAR, ELEMENT, COUNT))

// Same pattern, but can't trivially locate the trailing element name,
// or variable name.
@@
identifier alloc =~ "vmalloc|vzalloc";
expression SOMETHING, COUNT, ELEMENT;
@@

- alloc(sizeof(SOMETHING) + COUNT * sizeof(ELEMENT))
+ alloc(CHECKME_struct_size(&SOMETHING, ELEMENT, COUNT))

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/gpu/drm/nouveau/nvkm/core/ramht.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/core/ramht.c b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c
index ccba4ae73cc5..8162e3d2359c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/ramht.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/ramht.c
@@ -144,8 +144,7 @@ nvkm_ramht_new(struct nvkm_device *device, u32 size, u32 align,
 	struct nvkm_ramht *ramht;
 	int ret, i;
 
-	if (!(ramht = *pramht = vzalloc(sizeof(*ramht) +
-					(size >> 3) * sizeof(*ramht->data))))
+	if (!(ramht = *pramht = vzalloc(struct_size(ramht, data, (size >> 3)))))
 		return -ENOMEM;
 
 	ramht->device = device;
-- 
2.17.0

  parent reply	other threads:[~2018-05-09  0:47 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-09  0:42 [RFC][PATCH 00/13] Provide saturating helpers for allocation Kees Cook
2018-05-09  0:42 ` [PATCH 01/13] compiler.h: enable builtin overflow checkers and add fallback code Kees Cook
2018-05-09  0:42 ` [PATCH 02/13] lib: add runtime test of check_*_overflow functions Kees Cook
2018-05-09  0:42 ` [PATCH 03/13] overflow.h: Add allocation size calculation helpers Kees Cook
2018-05-09 18:27   ` Rasmus Villemoes
2018-05-09 18:49     ` Kees Cook
2018-05-09  0:42 ` [PATCH 04/13] mm: Use array_size() helpers for kmalloc() Kees Cook
2018-05-09 11:34   ` Matthew Wilcox
2018-05-09 17:58     ` Kees Cook
2018-05-09 18:00     ` Rasmus Villemoes
2018-05-09 18:07       ` Kees Cook
2018-05-09 18:39         ` Rasmus Villemoes
2018-05-09  0:42 ` [PATCH 05/13] mm: Use array_size() helpers for kvmalloc() Kees Cook
2018-05-09  0:42 ` [PATCH 06/13] treewide: Use struct_size() for kmalloc()-family Kees Cook
2018-05-09  0:42 ` Kees Cook [this message]
2018-05-09  0:42 ` [PATCH 08/13] treewide: Use struct_size() for devm_kmalloc() and friends Kees Cook
2018-05-09  0:42 ` [PATCH 09/13] treewide: Use array_size() for kmalloc()-family Kees Cook
2018-05-09  0:42 ` [PATCH 10/13] treewide: Use array_size() for kmalloc()-family, leftovers Kees Cook
2018-05-09  0:42 ` [PATCH 11/13] treewide: Use array_size() for vmalloc() Kees Cook
2018-05-09  0:42 ` [PATCH 12/13] treewide: Use array_size() for devm_*alloc()-like Kees Cook
2018-05-09  0:42 ` [PATCH 13/13] treewide: Use array_size() for devm_*alloc()-like, leftovers Kees Cook
2018-05-09 16:08 ` [RFC][PATCH 00/13] Provide saturating helpers for allocation Laura Abbott
2018-05-09 17:01   ` Kees Cook

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