linux-kernel - [PATCH 2/2] drm/imagination: Fix error path in pvr_vm_create

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Date:   Wed, 13 Dec 2023 14:44:31 +0000
From:   Donald Robson <donald.robson@...tec.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     <frank.binns@...tec.com>, <donald.robson@...tec.com>,
        <matt.coster@...tec.com>, <maarten.lankhorst@...ux.intel.com>,
        <mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
        <daniel@...ll.ch>, Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH 2/2] drm/imagination: Fix error path in pvr_vm_create_context

It is possible to double free the vm_ctx->mmu_ctx object in this
function.

    630 err_page_table_destroy:
--> 631         pvr_mmu_context_destroy(vm_ctx->mmu_ctx);

The pvr_vm_context_put() function does:

        kref_put(&vm_ctx->ref_count, pvr_vm_context_release);

Here the pvr_vm_context_release() will call:

        pvr_mmu_context_destroy(vm_ctx->mmu_ctx);

Refactor to an unwind style.

Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Donald Robson <donald.robson@...tec.com>
---
 drivers/gpu/drm/imagination/pvr_vm.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_vm.c b/drivers/gpu/drm/imagination/pvr_vm.c
index 432168aba577..93155eccc50d 100644
--- a/drivers/gpu/drm/imagination/pvr_vm.c
+++ b/drivers/gpu/drm/imagination/pvr_vm.c
@@ -598,23 +598,12 @@ pvr_vm_create_context(struct pvr_device *pvr_dev, bool is_userspace_context)
 	if (!vm_ctx)
 		return ERR_PTR(-ENOMEM);
 
-	drm_gem_private_object_init(&pvr_dev->base, &vm_ctx->dummy_gem, 0);
-
 	vm_ctx->pvr_dev = pvr_dev;
-	kref_init(&vm_ctx->ref_count);
-	mutex_init(&vm_ctx->lock);
-
-	drm_gpuvm_init(&vm_ctx->gpuvm_mgr,
-		       is_userspace_context ? "PowerVR-user-VM" : "PowerVR-FW-VM",
-		       0, &pvr_dev->base, &vm_ctx->dummy_gem,
-		       0, 1ULL << device_addr_bits, 0, 0, &pvr_vm_gpuva_ops);
 
 	vm_ctx->mmu_ctx = pvr_mmu_context_create(pvr_dev);
 	err = PTR_ERR_OR_ZERO(vm_ctx->mmu_ctx);
-	if (err) {
-		vm_ctx->mmu_ctx = NULL;
-		goto err_put_ctx;
-	}
+	if (err)
+		goto err_free;
 
 	if (is_userspace_context) {
 		err = pvr_fw_object_create(pvr_dev, sizeof(struct rogue_fwif_fwmemcontext),
@@ -625,13 +614,22 @@ pvr_vm_create_context(struct pvr_device *pvr_dev, bool is_userspace_context)
 			goto err_page_table_destroy;
 	}
 
+	drm_gem_private_object_init(&pvr_dev->base, &vm_ctx->dummy_gem, 0);
+	drm_gpuvm_init(&vm_ctx->gpuvm_mgr,
+		       is_userspace_context ? "PowerVR-user-VM" : "PowerVR-FW-VM",
+		       0, &pvr_dev->base, &vm_ctx->dummy_gem,
+		       0, 1ULL << device_addr_bits, 0, 0, &pvr_vm_gpuva_ops);
+
+	mutex_init(&vm_ctx->lock);
+	kref_init(&vm_ctx->ref_count);
+
 	return vm_ctx;
 
 err_page_table_destroy:
 	pvr_mmu_context_destroy(vm_ctx->mmu_ctx);
 
-err_put_ctx:
-	pvr_vm_context_put(vm_ctx);
+err_free:
+	kfree(vm_ctx);
 
 	return ERR_PTR(err);
 }
-- 
2.25.1