[57_maintenance] Prevent buffer builder length overflow in MutableBuffer::extend_zeros (#9820)#9926
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alamb merged 1 commit intoapache:57_maintenancefrom May 6, 2026
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…s` (apache#9820) - None. BufferBuilder reserve paths relied on unchecked usize arithmetic when calculating the required byte length. In optimized builds, very large requested lengths could wrap before capacity growth. This adds checked arithmetic for MutableBuffer byte length calculations used by reserve and zero-extension paths. Yes. This adds regression coverage for overflowing BufferBuilder length calculations through reserve, append_n_zeroed, and advance. Invalid requested lengths whose byte size cannot be represented without overflow now panic consistently. There are no API changes.
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alamb
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May 5, 2026
| self.resize(self.len + additional, 0); | ||
| let new_len = self | ||
| .len | ||
| .checked_add(additional) |
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57.3.1(May 2026) #9858This PR:
MutableBuffer::extend_zeros#9820 from @alamb to the57_maintenancelineNote:
MutableBuffer::extend_bool_trusted_lenis not present on the57_maintenanceline, so this backport omits the hunk for that API.