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Provide sysfb helpers for validating framebuffer integer values against limits. Update drivers. If a driver did not specify a limit for a certain value, use INT_MAX. v2: - declare module information near EOF (Javier) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/20250410083834.10810-3-tzimmermann@suse.de
35 lines
866 B
C
35 lines
866 B
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/export.h>
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#include <linux/limits.h>
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#include <linux/minmax.h>
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#include <linux/module.h>
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#include <drm/drm_print.h>
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#include "drm_sysfb_helper.h"
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int drm_sysfb_get_validated_int(struct drm_device *dev, const char *name,
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u64 value, u32 max)
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{
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if (value > min(max, INT_MAX)) {
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drm_warn(dev, "%s of %llu exceeds maximum of %u\n", name, value, max);
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return -EINVAL;
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}
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return value;
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}
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EXPORT_SYMBOL(drm_sysfb_get_validated_int);
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int drm_sysfb_get_validated_int0(struct drm_device *dev, const char *name,
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u64 value, u32 max)
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{
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if (!value) {
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drm_warn(dev, "%s of 0 not allowed\n", name);
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return -EINVAL;
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}
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return drm_sysfb_get_validated_int(dev, name, value, max);
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}
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EXPORT_SYMBOL(drm_sysfb_get_validated_int0);
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MODULE_DESCRIPTION("Helpers for DRM sysfb drivers");
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MODULE_LICENSE("GPL");
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