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From: Eric Anholt <eric@anholt.net>
To: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org, Eric Anholt <eric@anholt.net>
Subject: [PATCH 2/2 RESEND] drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.
Date: Wed,  1 Mar 2017 10:56:02 -0800	[thread overview]
Message-ID: <20170301185602.6873-2-eric@anholt.net> (raw)
In-Reply-To: <20170301185602.6873-1-eric@anholt.net>

If a CMA allocation failed, the partially constructed BO would be
unreferenced through the normal path, and we might choose to put it in
the BO cache.  If we then reused it before it expired from the cache,
the kernel would OOPS.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: c826a6e10644 ("drm/vc4: Add a BO cache.")
---
 drivers/gpu/drm/vc4/vc4_bo.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
index e5c7aa935b4b..af29432a6471 100644
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -317,6 +317,14 @@ void vc4_free_object(struct drm_gem_object *gem_bo)
 		goto out;
 	}
 
+	/* If this object was partially constructed but CMA allocation
+	 * had failed, just free it.
+	 */
+	if (!bo->base.vaddr) {
+		vc4_bo_destroy(bo);
+		goto out;
+	}
+
 	cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
 	if (!cache_list) {
 		vc4_bo_destroy(bo);
-- 
2.11.0

WARNING: multiple messages have this Message-ID (diff)
From: Eric Anholt <eric@anholt.net>
To: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 2/2 RESEND] drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.
Date: Wed,  1 Mar 2017 10:56:02 -0800	[thread overview]
Message-ID: <20170301185602.6873-2-eric@anholt.net> (raw)
In-Reply-To: <20170301185602.6873-1-eric@anholt.net>

If a CMA allocation failed, the partially constructed BO would be
unreferenced through the normal path, and we might choose to put it in
the BO cache.  If we then reused it before it expired from the cache,
the kernel would OOPS.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: c826a6e10644 ("drm/vc4: Add a BO cache.")
---
 drivers/gpu/drm/vc4/vc4_bo.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_bo.c b/drivers/gpu/drm/vc4/vc4_bo.c
index e5c7aa935b4b..af29432a6471 100644
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -317,6 +317,14 @@ void vc4_free_object(struct drm_gem_object *gem_bo)
 		goto out;
 	}
 
+	/* If this object was partially constructed but CMA allocation
+	 * had failed, just free it.
+	 */
+	if (!bo->base.vaddr) {
+		vc4_bo_destroy(bo);
+		goto out;
+	}
+
 	cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
 	if (!cache_list) {
 		vc4_bo_destroy(bo);
-- 
2.11.0

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  reply	other threads:[~2017-03-01 18:57 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-01 18:56 [PATCH 1/2 RESEND] drm/vc4: Fulfill user BO creation requests from the kernel BO cache Eric Anholt
2017-03-01 18:56 ` Eric Anholt
2017-03-01 18:56 ` Eric Anholt [this message]
2017-03-01 18:56   ` [PATCH 2/2 RESEND] drm/vc4: Fix OOPSes from trying to cache a partially constructed BO Eric Anholt
2017-03-02  8:14   ` Boris Brezillon
2017-03-02  8:14     ` Boris Brezillon
2017-03-02  8:08 ` [PATCH 1/2 RESEND] drm/vc4: Fulfill user BO creation requests from the kernel BO cache Boris Brezillon
2017-03-02  8:08   ` Boris Brezillon

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