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