[PATCH 4.18 042/350] drm: fix use of freed memory in drm_mode_setcrtc

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>

[ Upstream commit 064253c1c0625efd0362a0b7ecdbe8bee2a2904d ]

drm_mode_setcrtc() retries modesetting in case one of the functions it
calls returns -EDEADLK. connector_set, mode and fb are freed before
retrying, but they are not set to NULL. This can cause
drm_mode_setcrtc() to use those variables.

For example: On the first try __drm_mode_set_config_internal() returns
-EDEADLK. connector_set, mode and fb are freed. Next retry starts, and
drm_modeset_lock_all_ctx() returns -EDEADLK, and we jump to 'out'. The
code will happily try to release all three again.

This leads to crashes of different kinds, depending on the sequence the
EDEADLKs happen.

Fix this by setting the three variables to NULL at the start of the
retry loop.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Reviewed-by: Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20180917110054.4053-1-tomi.valkeinen@xxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_crtc.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -560,9 +560,9 @@ int drm_mode_setcrtc(struct drm_device *
 	struct drm_mode_crtc *crtc_req = data;
 	struct drm_crtc *crtc;
 	struct drm_plane *plane;
-	struct drm_connector **connector_set = NULL, *connector;
-	struct drm_framebuffer *fb = NULL;
-	struct drm_display_mode *mode = NULL;
+	struct drm_connector **connector_set, *connector;
+	struct drm_framebuffer *fb;
+	struct drm_display_mode *mode;
 	struct drm_mode_set set;
 	uint32_t __user *set_connectors_ptr;
 	struct drm_modeset_acquire_ctx ctx;
@@ -591,6 +591,10 @@ int drm_mode_setcrtc(struct drm_device *
 	mutex_lock(&crtc->dev->mode_config.mutex);
 	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
 retry:
+	connector_set = NULL;
+	fb = NULL;
+	mode = NULL;
+
 	ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
 	if (ret)
 		goto out;