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From: j.glisse@gmail.com
To: dri-devel@lists.freedesktop.org
Cc: Jerome Glisse <jglisse@redhat.com>
Subject: [PATCH] drm/radeon: fix rare segfault
Date: Mon,  2 Jul 2012 12:40:54 -0400	[thread overview]
Message-ID: <1341247254-10516-1-git-send-email-j.glisse@gmail.com> (raw)

From: Jerome Glisse <jglisse@redhat.com>

In gem idle/busy ioctl the radeon object was derefenced after
drm_gem_object_unreference_unlocked which in case the object
have been destroyed lead to use of a possibly free pointer with
possibly wrong data.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
---
 drivers/gpu/drm/radeon/radeon_gem.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 74176c5..c8838fc 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -325,6 +325,7 @@ int radeon_gem_mmap_ioctl(struct drm_device *dev, void *data,
 int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *filp)
 {
+	struct radeon_device *rdev = dev->dev_private;
 	struct drm_radeon_gem_busy *args = data;
 	struct drm_gem_object *gobj;
 	struct radeon_bo *robj;
@@ -350,13 +351,14 @@ int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
 		break;
 	}
 	drm_gem_object_unreference_unlocked(gobj);
-	r = radeon_gem_handle_lockup(robj->rdev, r);
+	r = radeon_gem_handle_lockup(rdev, r);
 	return r;
 }
 
 int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
 			      struct drm_file *filp)
 {
+	struct radeon_device *rdev = dev->dev_private;
 	struct drm_radeon_gem_wait_idle *args = data;
 	struct drm_gem_object *gobj;
 	struct radeon_bo *robj;
@@ -369,10 +371,10 @@ int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
 	robj = gem_to_radeon_bo(gobj);
 	r = radeon_bo_wait(robj, NULL, false);
 	/* callback hw specific functions if any */
-	if (robj->rdev->asic->ioctl_wait_idle)
-		robj->rdev->asic->ioctl_wait_idle(robj->rdev, robj);
+	if (rdev->asic->ioctl_wait_idle)
+		robj->rdev->asic->ioctl_wait_idle(rdev, robj);
 	drm_gem_object_unreference_unlocked(gobj);
-	r = radeon_gem_handle_lockup(robj->rdev, r);
+	r = radeon_gem_handle_lockup(rdev, r);
 	return r;
 }
 
-- 
1.7.10.2

             reply	other threads:[~2012-07-02 16:43 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-02 16:40 j.glisse [this message]
2012-07-02 20:25 ` [PATCH] drm/radeon: fix rare segfault Alex Deucher
2012-07-03  9:29 ` Christian König

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