drm/vmwgfx: Limit display layout ioctl array size to VMWGFX_NUM_DISPLAY_UNITS

Currently the array size is only limited by the largest kmalloc size which
is incorrect. This change will also return a more specific error message
than ENOMEM to userspace.

Signed-off-by: Ian Forbes <ian.forbes@broadcom.com>
Reviewed-by: Zack Rusin <zack.rusin@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240808200634.1074083-1-ian.forbes@broadcom.com

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 3f4719b3c26818202c87583ca08c25703c8622a7..4e2807f5f94cf374b0f6e51f9d03235b859f7776 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -62,7 +62,7 @@
 #define VMWGFX_DRIVER_MINOR 20
 #define VMWGFX_DRIVER_PATCHLEVEL 0
 #define VMWGFX_FIFO_STATIC_SIZE (1024*1024)
-#define VMWGFX_MAX_DISPLAYS 16
+#define VMWGFX_NUM_DISPLAY_UNITS 8
 #define VMWGFX_CMD_BOUNCE_INIT_SIZE 32768
 
 #define VMWGFX_MIN_INITIAL_WIDTH 1280
@@ -82,7 +82,7 @@
 #define VMWGFX_NUM_GB_CONTEXT 256
 #define VMWGFX_NUM_GB_SHADER 20000
 #define VMWGFX_NUM_GB_SURFACE 32768
-#define VMWGFX_NUM_GB_SCREEN_TARGET VMWGFX_MAX_DISPLAYS
+#define VMWGFX_NUM_GB_SCREEN_TARGET VMWGFX_NUM_DISPLAY_UNITS
 #define VMWGFX_NUM_DXCONTEXT 256
 #define VMWGFX_NUM_DXQUERY 512
 #define VMWGFX_NUM_MOB (VMWGFX_NUM_GB_CONTEXT +\

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 288ed0bb75cb986c94086323202f18dad3bdb3ee..884804274dfb14de9391bcb9bb528b85ea34d656 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2225,7 +2225,7 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
        struct drm_mode_config *mode_config = &dev->mode_config;
        struct drm_vmw_update_layout_arg *arg =
                (struct drm_vmw_update_layout_arg *)data;
-       void __user *user_rects;
+       const void __user *user_rects;
        struct drm_vmw_rect *rects;
        struct drm_rect *drm_rects;
        unsigned rects_size;
@@ -2237,6 +2237,8 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
                                            VMWGFX_MIN_INITIAL_HEIGHT};
                vmw_du_update_layout(dev_priv, 1, &def_rect);
                return 0;
+       } else if (arg->num_outputs > VMWGFX_NUM_DISPLAY_UNITS) {
+               return -E2BIG;
        }
 
        rects_size = arg->num_outputs * sizeof(struct drm_vmw_rect);

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
index 6141fadf81efeb2cda7d91274dce16def626e46d..2a6c6d6581e02bb51c9d70cef3ddce1a0f9ecd1a 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
@@ -199,9 +199,6 @@ struct vmw_kms_dirty {
        s32 unit_y2;
 };
 
-#define VMWGFX_NUM_DISPLAY_UNITS 8
-
-
 #define vmw_framebuffer_to_vfb(x) \
        container_of(x, struct vmw_framebuffer, base)
 #define vmw_framebuffer_to_vfbs(x) \