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36 lines
1.3 KiB
Go
36 lines
1.3 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package imageutils
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import (
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"image"
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)
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// MaxPixels bounds allocations from attacker-controlled dimensions.
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const MaxPixels = 50_000_000 // 50 megapixels
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// Division avoids overflow from multiplying hostile dimensions.
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func ValidateConfig(cfg image.Config) error {
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if cfg.Width <= 0 || cfg.Height <= 0 {
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return &ErrImageTooLarge{Width: cfg.Width, Height: cfg.Height}
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}
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if cfg.Width > MaxPixels/cfg.Height {
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return &ErrImageTooLarge{Width: cfg.Width, Height: cfg.Height}
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}
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return nil
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}
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