crypto: fix UB in computing max message size #21462
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Before this commit it computed `(1<<(8*(15-iv_len)))-1` for `iv_len>=11` and that reduces to `(1<<32)-1` for `iv_len==11`. Left-shifting past the sign bit and overflowing a signed integral type are both undefined behaviors. This commit switches to fixed values and restricts the `iv_len==11` case to `INT_MAX`, as was already the case for all `iv_len<=10`. PR-URL: nodejs#21462 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Tobias Nießen <tniessen@tnie.de>
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Before this commit it computed `(1<<(8*(15-iv_len)))-1` for `iv_len>=11` and that reduces to `(1<<32)-1` for `iv_len==11`. Left-shifting past the sign bit and overflowing a signed integral type are both undefined behaviors. This commit switches to fixed values and restricts the `iv_len==11` case to `INT_MAX`, as was already the case for all `iv_len<=10`. PR-URL: #21462 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Tobias Nießen <tniessen@tnie.de>
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Before this commit it computed
(1<<(8*(15-iv_len)))-1foriv_len>=11and that reduces to
(1<<32)-1foriv_len==11. Left-shifting pastthe sign bit and overflowing a signed integral type are both undefined
behaviors.
This commit switches to fixed values and restricts the
iv_len==11case to
INT_MAX, as was already the case for alliv_len<=10.