The patch below does not apply to the 4.8-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From e94bd1736f1f60e916a85a80c0b0ebeaae36cce5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@xxxxxxx>
Date: Wed, 30 Nov 2016 17:30:01 +0900
Subject: [PATCH] drm: Don't call drm_for_each_crtc with a non-KMS driver
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fixes oops if userspace calls DRM_IOCTL_GET_CAP for
DRM_CAP_PAGE_FLIP_TARGET on a non-KMS device node. (Normal userspace
doesn't do that, discovered by syzkaller)
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Fixes: f837297ad824 ("drm: Add DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags v2")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michel Dänzer <michel.daenzer@xxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20161130083002.1520-1-michel@xxxxxxxxxxx
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 0ad2c47f808f..71c3473476c7 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -254,10 +254,12 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
req->value = dev->mode_config.async_page_flip;
break;
case DRM_CAP_PAGE_FLIP_TARGET:
- req->value = 1;
- drm_for_each_crtc(crtc, dev) {
- if (!crtc->funcs->page_flip_target)
- req->value = 0;
+ if (drm_core_check_feature(dev, DRIVER_MODESET)) {
+ req->value = 1;
+ drm_for_each_crtc(crtc, dev) {
+ if (!crtc->funcs->page_flip_target)
+ req->value = 0;
+ }
}
break;
case DRM_CAP_CURSOR_WIDTH:
--
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