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drm/radeon/radeon_kms: Fix a NULL pointer dereference in radeon_driver_open_kms()

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[ Upstream commit ab50cb9df8 ]

In radeon_driver_open_kms(), radeon_vm_bo_add() is assigned to
vm->ib_bo_va and passes and used in radeon_vm_bo_set_addr(). In
radeon_vm_bo_set_addr(), there is a dereference of vm->ib_bo_va,
which could lead to a NULL pointer dereference on failure of
radeon_vm_bo_add().

Fix this bug by adding a check of vm->ib_bo_va.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_DRM_RADEON=m show no new warnings,
and our static analyzer no longer warns about this code.

Fixes: cc9e67e3d7 ("drm/radeon: fix VM IB handling")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Zhou Qingyang <zhou1615@umn.edu>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhou Qingyang
2021-12-01 23:13:10 +08:00
committed by Greg Kroah-Hartman
parent 3ca1b3b82f
commit f277978d6c
1 changed files with 20 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/gpu/drm/radeon/radeon_kms.c
View File

@@ -634,6 +634,8 @@ void radeon_driver_lastclose_kms(struct drm_device *dev)
int radeon_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
{
struct radeon_device *rdev = dev->dev_private;
struct radeon_fpriv *fpriv;
struct radeon_vm *vm;
int r;
file_priv->driver_priv = NULL;
@@ -646,8 +648,6 @@ int radeon_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
/* new gpu have virtual address space support */
if (rdev->family >= CHIP_CAYMAN) {
struct radeon_fpriv *fpriv;
struct radeon_vm *vm;
fpriv = kzalloc(sizeof(*fpriv), GFP_KERNEL);
if (unlikely(!fpriv)) {
@@ -658,35 +658,39 @@ int radeon_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
if (rdev->accel_working) {
vm = &fpriv->vm;
r = radeon_vm_init(rdev, vm);
if (r) {
kfree(fpriv);
goto out_suspend;
}
if (r)
goto out_fpriv;
r = radeon_bo_reserve(rdev->ring_tmp_bo.bo, false);
if (r) {
radeon_vm_fini(rdev, vm);
kfree(fpriv);
goto out_suspend;
}
if (r)
goto out_vm_fini;
/* map the ib pool buffer read only into
* virtual address space */
vm->ib_bo_va = radeon_vm_bo_add(rdev, vm,
rdev->ring_tmp_bo.bo);
if (!vm->ib_bo_va) {
r = -ENOMEM;
goto out_vm_fini;
}
r = radeon_vm_bo_set_addr(rdev, vm->ib_bo_va,
RADEON_VA_IB_OFFSET,
RADEON_VM_PAGE_READABLE |
RADEON_VM_PAGE_SNOOPED);
if (r) {
radeon_vm_fini(rdev, vm);
kfree(fpriv);
goto out_suspend;
}
if (r)
goto out_vm_fini;
}
file_priv->driver_priv = fpriv;
}
if (!r)
goto out_suspend;
out_vm_fini:
radeon_vm_fini(rdev, vm);
out_fpriv:
kfree(fpriv);
out_suspend:
pm_runtime_mark_last_busy(dev->dev);
pm_runtime_put_autosuspend(dev->dev);