提交 81fbd232 编写于 作者: C Chris Wilson 提交者: Greg Kroah-Hartman

dma-buf/sw_sync: Synchronize signal vs syncpt free

[ Upstream commit d3c6dd1fb30d3853c2012549affe75c930f4a2f9 ]

During release of the syncpt, we remove it from the list of syncpt and
the tree, but only if it is not already been removed. However, during
signaling, we first remove the syncpt from the list. So, if we
concurrently free and signal the syncpt, the free may decide that it is
not part of the tree and immediately free itself -- meanwhile the
signaler goes on to use the now freed datastructure.

In particular, we get struck by commit 0e2f733addbf ("dma-buf: make
dma_fence structure a bit smaller v2") as the cb_list is immediately
clobbered by the kfree_rcu.

v2: Avoid calling into timeline_fence_release() from under the spinlock

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111381
Fixes: d3862e44 ("dma-buf/sw-sync: Fix locking around sync_timeline lists")
References: 0e2f733addbf ("dma-buf: make dma_fence structure a bit smaller v2")
Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Christian König <christian.koenig@amd.com>
Cc: <stable@vger.kernel.org> # v4.14+
Acked-by: NChristian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812154247.20508-1-chris@chris-wilson.co.ukSigned-off-by: NSasha Levin <sashal@kernel.org>
上级 c76e1897
无相关合并请求
......@@ -141,17 +141,14 @@ static void timeline_fence_release(struct dma_fence *fence)
{
struct sync_pt *pt = dma_fence_to_sync_pt(fence);
struct sync_timeline *parent = dma_fence_parent(fence);
unsigned long flags;
spin_lock_irqsave(fence->lock, flags);
if (!list_empty(&pt->link)) {
unsigned long flags;
spin_lock_irqsave(fence->lock, flags);
if (!list_empty(&pt->link)) {
list_del(&pt->link);
rb_erase(&pt->node, &parent->pt_tree);
}
spin_unlock_irqrestore(fence->lock, flags);
list_del(&pt->link);
rb_erase(&pt->node, &parent->pt_tree);
}
spin_unlock_irqrestore(fence->lock, flags);
sync_timeline_put(parent);
dma_fence_free(fence);
......@@ -274,7 +271,8 @@ static struct sync_pt *sync_pt_create(struct sync_timeline *obj,
p = &parent->rb_left;
} else {
if (dma_fence_get_rcu(&other->base)) {
dma_fence_put(&pt->base);
sync_timeline_put(obj);
kfree(pt);
pt = other;
goto unlock;
}
......
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