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R. Silva" , Kees Cook Cc: Erick Archer , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] drm/radeon/radeon_display: Decrease the size of allocated memory Date: Thu, 22 Feb 2024 19:04:31 +0100 Message-Id: <20240222180431.7451-1-erick.archer@gmx.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:3J4zUxuFIkyhkOjHp/ue4LzXSV3U6rOdF1p0AgSup15g6kK00uG DmJLdoaRwGRe5f2qq9TF+vQJmrciGXreAXqmvSGrVbEE52xruGo2xffmvdjfeq6/GHOqmET PeUYcDWo4xI8GkbTbNGrN198gjIYifX27qe2hP47m5Bf5PISmUD9IPPJpaMOZ+CF2KA4NVN mbFvp01Mbsrv1ICuZOFmw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:3uDifHXcSuA=;A8YDne8bR0TkYKttHQ5ey2DZQ29 bUO8VrMnhNaP8j3TpBz76LW94hPjA68BSR+GSHq9V0j3kEut1snMRalqSq3DrwfT6W6oEZPiR WLH2XpxpR8oy5QkZf5ddINcsDeHYDz5/GbkWcp+phh0RR+8rE8WY0HnxQkMlZ6EmLY2SchbQ4 VBwuiGuiM15oRwRETo3QqfXiNrOHPy+2rLtgEJ6w7zxhVvwmeqZ4QvPQlYHSnIRefAhQnnnIr DkJwSHmU62ff5kfEgOA4KWhKt8eYDYeeRZRs3enKk1XG9j69rkDSzs5GKFZabGK9wUwD1232Y ujuL1SryLJeI2Q1ksQV7yT8GPVxhPOwktYlxhUgfwvaJyJXN9TwPWtgdApkQlQReTFawGkrmV TItgu8PqEkDkeV1zk3h5uF8qVWPTYDgi0v+9fuBIT5Nn5WFT4V+XPCJPNIhGSABetgRd8QKfO /mKUO7ytH8e1RQlkguNxXjRsEz7/WSQMfls5S2F7l6OxE9SzgP7kdk7n2BcSu7I1nkYJ/R49F oXyVo9OzKZd2NTJfVKUKKXxPYui3rOnZ743lHbA+YafoWCx0j0+VrlVn2a/XtWDJXQX+jSCMd 1uo82ictjD62gKWt+T3SHmee9EVH7Zar9Vb/MAtH0N296P9Pxvmuy1S9QK6TOoAM4bbHmq+I2 RcLJpeTRZVsrzZCnPs9PXKM6UEkuaaX85ioeRJlcQzRnRU50/R/DILTB5H+6dD1RTPPXqpLWo V6lZ+d0K+JZY39b1XfaNRwEifoerHQN3Xp9Lb6dCFoe5Oc6Gx1wztaaK41mFkjm/6jQle2Y8L 5WK+nor6RlDmGTkqYTxp346oe5DJ5y26DD/2WNuwfeAMs= This is an effort to get rid of all multiplications from allocation functions in order to prevent integer overflows [1] [2]. In this case, the memory allocated to store RADEONFB_CONN_LIMIT pointers to "drm_connector" structures can be avoided. This is because this memory area is never accessed. Also, in the kzalloc function, it is preferred to use sizeof(*pointer) instead of sizeof(type) due to the type of the variable can change and one needs not change the former (unlike the latter). At the same time take advantage to remove the "#if 0" block, the code where the removed memory area was accessed, and the RADEONFB_CONN_LIMIT constant due to now is never used. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#open-= coded-arithmetic-in-allocator-arguments [1] Link: https://github.com/KSPP/linux/issues/160 [2] Signed-off-by: Erick Archer =2D-- drivers/gpu/drm/radeon/radeon.h | 1 - drivers/gpu/drm/radeon/radeon_display.c | 8 +------- 2 files changed, 1 insertion(+), 8 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/rade= on.h index 3e5ff17e3caf..0999c8eaae94 100644 =2D-- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -132,7 +132,6 @@ extern int radeon_cik_support; /* RADEON_IB_POOL_SIZE must be a power of 2 */ #define RADEON_IB_POOL_SIZE 16 #define RADEON_DEBUGFS_MAX_COMPONENTS 32 -#define RADEONFB_CONN_LIMIT 4 #define RADEON_BIOS_NUM_SCRATCH 8 /* internal ring indices */ diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/rad= eon/radeon_display.c index efd18c8d84c8..5f1d24d3120c 100644 =2D-- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -683,7 +683,7 @@ static void radeon_crtc_init(struct drm_device *dev, i= nt index) struct radeon_device *rdev =3D dev->dev_private; struct radeon_crtc *radeon_crtc; - radeon_crtc =3D kzalloc(sizeof(struct radeon_crtc) + (RADEONFB_CONN_LIMI= T * sizeof(struct drm_connector *)), GFP_KERNEL); + radeon_crtc =3D kzalloc(sizeof(*radeon_crtc), GFP_KERNEL); if (radeon_crtc =3D=3D NULL) return; @@ -709,12 +709,6 @@ static void radeon_crtc_init(struct drm_device *dev, = int index) dev->mode_config.cursor_width =3D radeon_crtc->max_cursor_width; dev->mode_config.cursor_height =3D radeon_crtc->max_cursor_height; -#if 0 - radeon_crtc->mode_set.crtc =3D &radeon_crtc->base; - radeon_crtc->mode_set.connectors =3D (struct drm_connector **)(radeon_cr= tc + 1); - radeon_crtc->mode_set.num_connectors =3D 0; -#endif - if (rdev->is_atom_bios && (ASIC_IS_AVIVO(rdev) || radeon_r4xx_atom)) radeon_atombios_init_crtc(dev, radeon_crtc); else =2D- 2.25.1