[Nouveau] [PATCH][next] nouveau/svm: Fix missing failure check on call to make_device_exclusive_range

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

The call to make_device_exclusive_range can potentially fail leaving
pointer page not initialized that leads to an uninitialized pointer
read issue. Fix this by adding a check to see if the call failed and
returning the error code.

Addresses-Coverity: ("Uninitialized pointer read")
Fixes: c620bba9828c ("nouveau/svm: implement atomic SVM access")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/gpu/drm/nouveau/nouveau_svm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c 
b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 84726a89e665..b913b4907088 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -609,8 +609,10 @@ static int nouveau_atomic_range_fault(struct nouveau_svmm 
*svmm,
 
                notifier_seq = mmu_interval_read_begin(&notifier->notifier);
                mmap_read_lock(mm);
-               make_device_exclusive_range(mm, start, start + PAGE_SIZE,
-                                           &page, drm->dev);
+               ret = make_device_exclusive_range(mm, start, start + PAGE_SIZE,
+                                                 &page, drm->dev);
+               if (ret < 0)
+                       goto out;
                mmap_read_unlock(mm);
                if (!page) {
                        ret = -EINVAL;
-- 
2.31.1

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