linux-kernel - [PATCH AUTOSEL 5.4 49/84] drm/nouveau/svm: fix vma range check for migration

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Date:   Wed, 15 Apr 2020 07:44:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ralph Campbell <rcampbell@...dia.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 49/84] drm/nouveau/svm: fix vma range check for migration

From: Ralph Campbell <rcampbell@...dia.com>

[ Upstream commit b92103b559c77abc5f8b7bec269230a219c880b7 ]

find_vma_intersection(mm, start, end) only guarantees that end is greater
than or equal to vma->vm_start but doesn't guarantee that start is
greater than or equal to vma->vm_start. The calculation for the
intersecting range in nouveau_svmm_bind() isn't accounting for this and
can call migrate_vma_setup() with a starting address less than
vma->vm_start. This results in migrate_vma_setup() returning -EINVAL for
the range instead of nouveau skipping that part of the range and migrating
the rest.

Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/nouveau/nouveau_svm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c
index 25b7055949c45..824654742a604 100644
--- a/drivers/gpu/drm/nouveau/nouveau_svm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_svm.c
@@ -186,6 +186,7 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
 		if (!vma)
 			break;
 
+		addr = max(addr, vma->vm_start);
 		next = min(vma->vm_end, end);
 		/* This is a best effort so we ignore errors */
 		nouveau_dmem_migrate_vma(cli->drm, vma, addr, next);
-- 
2.20.1