linux-kernel - [PATCH 03/26] drm/gud: use array

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230623211457.102544-4-Julia.Lawall@inria.fr>
Date:   Fri, 23 Jun 2023 23:14:34 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Noralf Trønnes <noralf@...nnes.org>
Cc:     keescook@...omium.org, kernel-janitors@...r.kernel.org,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 03/26] drm/gud: use array_size

Use array_size to protect against multiplication overflows.

The changes were done using the following Coccinelle semantic patch:

// <smpl>
@@
    expression E1, E2;
    constant C1, C2;
    identifier alloc = {vmalloc,vzalloc};
@@
    
(
      alloc(C1 * C2,...)
|
      alloc(
-           (E1) * (E2)
+           array_size(E1, E2)
      ,...)
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/gpu/drm/gud/gud_pipe.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gud/gud_pipe.c b/drivers/gpu/drm/gud/gud_pipe.c
index dc16a92625d4..34df847bd829 100644
--- a/drivers/gpu/drm/gud/gud_pipe.c
+++ b/drivers/gpu/drm/gud/gud_pipe.c
@@ -390,7 +390,7 @@ static int gud_fb_queue_damage(struct gud_device *gdrm, struct drm_framebuffer *
 	mutex_lock(&gdrm->damage_lock);
 
 	if (!gdrm->shadow_buf) {
-		gdrm->shadow_buf = vzalloc(fb->pitches[0] * fb->height);
+		gdrm->shadow_buf = vzalloc(array_size(fb->pitches[0], fb->height));
 		if (!gdrm->shadow_buf) {
 			mutex_unlock(&gdrm->damage_lock);
 			return -ENOMEM;