From: Rob Clark robdclark@chromium.org
commit 41d419382ec7e257e54b7b6ff0d3623aafb1316d upstream.
Adding the vm to the vm_xa table makes it visible to userspace, which could try to race with us to close the vm. So we need to take our extra reference before putting it in the table.
Signed-off-by: Rob Clark robdclark@chromium.org Reviewed-by: Matthew Auld matthew.auld@intel.com Fixes: 9ec8795e7d91 ("drm/i915: Drop __rcu from gem_context->vm") Cc: stable@vger.kernel.org # v5.16+ Signed-off-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20230119173321.2825472-1-robdc... (cherry picked from commit 99343c46d4e2b34c285d3d5f68ff04274c2f9fb4) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/gem/i915_gem_context.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index 6250de9b9196..e4b78ab4773b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -1861,11 +1861,19 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv, vm = ctx->vm; GEM_BUG_ON(!vm);
+ /* + * Get a reference for the allocated handle. Once the handle is + * visible in the vm_xa table, userspace could try to close it + * from under our feet, so we need to hold the extra reference + * first. + */ + i915_vm_get(vm); + err = xa_alloc(&file_priv->vm_xa, &id, vm, xa_limit_32b, GFP_KERNEL); - if (err) + if (err) { + i915_vm_put(vm); return err; - - i915_vm_get(vm); + }
GEM_BUG_ON(id == 0); /* reserved for invalid/unassigned ppgtt */ args->value = id;