From 1935f0deb6116dd785ea64d8035eab0ff441255b Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Tue, 4 Apr 2023 21:40:36 +0200 Subject: drm/fb-helper: set x/yres_virtual in drm_fb_helper_check_var Drivers are supposed to fix this up if needed if they don't outright reject it. Uncovered by 6c11df58fd1a ("fbmem: Check virtual screen sizes in fb_set_var()"). Reported-by: syzbot+20dcf81733d43ddff661@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?id=c5faf983bfa4a607de530cd3bb008888bf06cefc Cc: stable@vger.kernel.org # v5.4+ Cc: Daniel Vetter Cc: Javier Martinez Canillas Cc: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20230404194038.472803-1-daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_fb_helper.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/gpu/drm') diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 63ec95e86d0e..aa9efc651a19 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1589,6 +1589,9 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var, return -EINVAL; } + var->xres_virtual = fb->width; + var->yres_virtual = fb->height; + /* * Workaround for SDL 1.2, which is known to be setting all pixel format * fields values to zero in some cases. We treat this situation as a -- cgit v1.2.3