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udhcp: make arpping code resistant to time jumps
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -118,8 +118,13 @@ int FAST_FUNC arpping(uint32_t test_nip,
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break;
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}
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}
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timeout_ms -= (unsigned)monotonic_ms() - prevTime;
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} while (timeout_ms > 0);
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timeout_ms -= (unsigned)monotonic_ms() - prevTime + 1;
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/* We used to check "timeout_ms > 0", but
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* this is more under/overflow-resistant
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* (people did see overflows here when system time jumps):
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*/
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} while ((unsigned)timeout_ms <= 2000);
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ret:
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close(s);
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