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Fix OOPSes in vc4 (Raspberry Pi)

This commit is contained in:
Peter Robinson 2017-02-09 19:10:55 +00:00
parent 2fcb309de9
commit a6f750fdff
2 changed files with 47 additions and 0 deletions
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42
drm-vc4-Fix-OOPSes-from-trying-to-cache-a-partially-constructed-BO..patch Normal file
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@ -0,0 +1,42 @@
From patchwork Thu Feb 9 18:16:00 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: drm/vc4: Fix OOPSes from trying to cache a partially constructed BO.
From: Eric Anholt <eric@anholt.net>
X-Patchwork-Id: 138087
Message-Id: <20170209181600.24048-1-eric@anholt.net>
To: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org, pbrobinson@gmail.com
Date: Thu, 9 Feb 2017 10:16:00 -0800
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 5ec14f25625d..fd83a2807656 100644
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -314,6 +314,14 @@ 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);

5
kernel.spec
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@ -524,6 +524,8 @@ Patch430: ARM-tegra-usb-no-reset.patch
Patch431: bcm2837-initial-support.patch
Patch432: drm-vc4-Fix-OOPSes-from-trying-to-cache-a-partially-constructed-BO..patch
# http://www.spinics.net/lists/linux-mmc/msg41151.html
Patch433: bcm283x-mmc-imp-speed.patch
@ -2194,6 +2196,9 @@ fi
#
#
%changelog
* Thu Feb 9 2017 Peter Robinson <pbrobinson@fedoraproject.org>
- Fix OOPSes in vc4 (Raspberry Pi)
* Thu Feb 09 2017 Laura Abbott <labbott@fedoraproject.org> - 4.9.9-200
- Linux v4.9.9
- Fix DMA on stack from 1-wire driver (rhbz 1415397)