[PATCH 6.1.y] nouveau/gem: reserve the bo in the info ioctl around the vma lookup

[Sasha Levin <sashal@kernel.org>]

From: Dave Airlie <airlied@redhat.com>

[ Upstream commit 5e17160d41d92823f3379c1982e1369680c5ce4d ]

In the non-uvmm path, there could be a race between the info lookup
finding the vma, and the gem close path closing the vma leading
to a use-after-free.

Spotted with the help of Opus 4.6.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Fixes: e758a3111914 ("drm/nouveau: fixup gem_info ioctl to return client-specific bo virtual")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260612020658.3176270-1-airlied@gmail.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
[ adapted VMM and UVMM handling to the legacy direct VMM selection and condition. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/nouveau/nouveau_gem.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 0ec96d9372cd7..571633c07e03e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -277,11 +277,20 @@ nouveau_gem_info(struct drm_file *file_priv, struct drm_gem_object *gem,
 		rep->domain = NOUVEAU_GEM_DOMAIN_VRAM;
 	rep->offset = nvbo->offset;
 	if (vmm->vmm.object.oclass >= NVIF_CLASS_VMM_NV50) {
+		int ret;
+
+		ret = ttm_bo_reserve(&nvbo->bo, false, false, NULL);
+		if (ret)
+			return ret;
+
 		vma = nouveau_vma_find(nvbo, vmm);
-		if (!vma)
+		if (!vma) {
+			ttm_bo_unreserve(&nvbo->bo);
 			return -EINVAL;
+		}
 
 		rep->offset = vma->addr;
+		ttm_bo_unreserve(&nvbo->bo);
 	}
 
 	rep->size = nvbo->bo.base.size;
-- 
2.53.0