From 6f331623b99e1900e3a664bbe6e95406ff4b27f4 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 9 Dec 2010 08:35:40 +0300 Subject: [PATCH] drm: use after free in drm_queue_vblank_event() The "e" pointer is either NULL or freed when we call drm_vblank_put(dev, e->pipe) on the error path. Just pass the "pipe" variable directly instead. I changed another caller to use "pipe" as well for consistency. Signed-off-by: Dan Carpenter Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_irq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 722700d5d73e..16d5155edad1 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -628,7 +628,7 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe, if ((seq - vblwait->request.sequence) <= (1 << 23)) { e->event.tv_sec = now.tv_sec; e->event.tv_usec = now.tv_usec; - drm_vblank_put(dev, e->pipe); + drm_vblank_put(dev, pipe); list_add_tail(&e->base.link, &e->base.file_priv->event_list); wake_up_interruptible(&e->base.file_priv->event_wait); trace_drm_vblank_event_delivered(current->pid, pipe, @@ -645,7 +645,7 @@ err_unlock: spin_unlock_irqrestore(&dev->event_lock, flags); kfree(e); err_put: - drm_vblank_put(dev, e->pipe); + drm_vblank_put(dev, pipe); return ret; } -- 2.20.1