/* * SPDX-License-Identifier: MIT * * Copyright © 2018 Intel Corporation */ #include <linux/nospec.h> #include <linux/sched/signal.h> #include <linux/uaccess.h> #include <uapi/drm/i915_drm.h> #include "i915_user_extensions.h" #include "i915_utils.h" int i915_user_extensions(struct i915_user_extension __user *ext, const i915_user_extension_fn *tbl, unsigned int count, void *data) { unsigned int stackdepth = 512; while (ext) { int i, err; u32 name; u64 next; if (!stackdepth--) /* recursion vs useful flexibility */ return -E2BIG; err = check_user_mbz(&ext->flags); if (err) return err; for (i = 0; i < ARRAY_SIZE(ext->rsvd); i++) { err = check_user_mbz(&ext->rsvd[i]); if (err) return err; } if (get_user(name, &ext->name)) return -EFAULT; err = -EINVAL; if (name < count) { name = array_index_nospec(name, count); if (tbl[name]) err = tbl[name](ext, data); } if (err) return err; if (get_user(next, &ext->next_extension) || overflows_type(next, uintptr_t)) return -EFAULT; ext = u64_to_user_ptr(next); } return 0; }