[v2] drm/fb-helper: Fix height, width, and accel_flags in fb_var
Commit Message
Fbtest contains some very simple validation of the fbdev userspace API
contract. When used with shmob-drm, it reports the following warnings
and errors:
height changed from 68 to 0
height was rounded down
width changed from 111 to 0
width was rounded down
accel_flags changed from 0 to 1
The first part happens because __fill_var() resets the physical
dimensions of the first connector, as filled in by drm_setup_crtcs_fb().
Fix this by retaining the original values.
The last part happens because __fill_var() forces the FB_ACCELF_TEXT
flag on, while fbtest disables all acceleration on purpose, so it can
draw safely to the frame buffer. Fix this by setting accel_flags to
zero, as DRM does not implement any text console acceleration.
Note that this issue can also be seen in the output of fbset, which
reports "accel true".
Fixes: ee4cce0a8f03a333 ("drm/fb-helper: fix input validation gaps in check_var")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
---
v2:
- Add Reviewed-by, Tested-by.
---
drivers/gpu/drm/drm_fb_helper.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
Comments
Thanks a lot. Pushed to drm-misc-fixes.
Am 23.05.23 um 17:06 schrieb Geert Uytterhoeven:
> Fbtest contains some very simple validation of the fbdev userspace API
> contract. When used with shmob-drm, it reports the following warnings
> and errors:
>
> height changed from 68 to 0
> height was rounded down
> width changed from 111 to 0
> width was rounded down
> accel_flags changed from 0 to 1
>
> The first part happens because __fill_var() resets the physical
> dimensions of the first connector, as filled in by drm_setup_crtcs_fb().
> Fix this by retaining the original values.
>
> The last part happens because __fill_var() forces the FB_ACCELF_TEXT
> flag on, while fbtest disables all acceleration on purpose, so it can
> draw safely to the frame buffer. Fix this by setting accel_flags to
> zero, as DRM does not implement any text console acceleration.
> Note that this issue can also be seen in the output of fbset, which
> reports "accel true".
>
> Fixes: ee4cce0a8f03a333 ("drm/fb-helper: fix input validation gaps in check_var")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
> ---
> v2:
> - Add Reviewed-by, Tested-by.
> ---
> drivers/gpu/drm/drm_fb_helper.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index f0e9549b6bd751de..8dc376b771d2cf22 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -1379,17 +1379,19 @@ static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
> }
> }
>
> -static void __fill_var(struct fb_var_screeninfo *var,
> +static void __fill_var(struct fb_var_screeninfo *var, struct fb_info *info,
> struct drm_framebuffer *fb)
> {
> int i;
>
> var->xres_virtual = fb->width;
> var->yres_virtual = fb->height;
> - var->accel_flags = FB_ACCELF_TEXT;
> + var->accel_flags = 0;
> var->bits_per_pixel = drm_format_info_bpp(fb->format, 0);
>
> - var->height = var->width = 0;
> + var->height = info->var.height;
> + var->width = info->var.width;
> +
> var->left_margin = var->right_margin = 0;
> var->upper_margin = var->lower_margin = 0;
> var->hsync_len = var->vsync_len = 0;
> @@ -1452,7 +1454,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
> return -EINVAL;
> }
>
> - __fill_var(var, fb);
> + __fill_var(var, info, fb);
>
> /*
> * fb_pan_display() validates this, but fb_set_par() doesn't and just
> @@ -1908,7 +1910,7 @@ static void drm_fb_helper_fill_var(struct fb_info *info,
> info->pseudo_palette = fb_helper->pseudo_palette;
> info->var.xoffset = 0;
> info->var.yoffset = 0;
> - __fill_var(&info->var, fb);
> + __fill_var(&info->var, info, fb);
> info->var.activate = FB_ACTIVATE_NOW;
>
> drm_fb_helper_fill_pixel_fmt(&info->var, format);
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
@@ -1379,17 +1379,19 @@ static void drm_fb_helper_fill_pixel_fmt(struct fb_var_screeninfo *var,
}
}
-static void __fill_var(struct fb_var_screeninfo *var,
+static void __fill_var(struct fb_var_screeninfo *var, struct fb_info *info,
struct drm_framebuffer *fb)
{
int i;
var->xres_virtual = fb->width;
var->yres_virtual = fb->height;
- var->accel_flags = FB_ACCELF_TEXT;
+ var->accel_flags = 0;
var->bits_per_pixel = drm_format_info_bpp(fb->format, 0);
- var->height = var->width = 0;
+ var->height = info->var.height;
+ var->width = info->var.width;
+
var->left_margin = var->right_margin = 0;
var->upper_margin = var->lower_margin = 0;
var->hsync_len = var->vsync_len = 0;
@@ -1452,7 +1454,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
return -EINVAL;
}
- __fill_var(var, fb);
+ __fill_var(var, info, fb);
/*
* fb_pan_display() validates this, but fb_set_par() doesn't and just
@@ -1908,7 +1910,7 @@ static void drm_fb_helper_fill_var(struct fb_info *info,
info->pseudo_palette = fb_helper->pseudo_palette;
info->var.xoffset = 0;
info->var.yoffset = 0;
- __fill_var(&info->var, fb);
+ __fill_var(&info->var, info, fb);
info->var.activate = FB_ACTIVATE_NOW;
drm_fb_helper_fill_pixel_fmt(&info->var, format);