Fixing UBSan issues that showed up in all-clusters app #35580
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PR #35580: Size comparison from 7789409 to 512efaf Full report (51 builds for bl602, bl702, bl702l, cyw30739, efr32, esp32, linux, nrfconnect, nxp, psoc6, qpg, stm32, tizen)
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andy31415
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Sep 13, 2024
andy31415
approved these changes
Sep 13, 2024
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PR #35580: Size comparison from 7789409 to c9ccaff Full report (82 builds for bl602, bl702, bl702l, cyw30739, efr32, esp32, linux, nrfconnect, nxp, psoc6, qpg, stm32, telink, tizen)
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cecille
approved these changes
Sep 13, 2024
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Error Message: BufferWriter.cpp:76:16: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long') when size becomes 0 and we are in while (size-- > 0), then size will become less than 0, which should be avoided since it is an unsigned (although technically it wraps around, UBSAN complains about it). Fix: stop size from decrement past 0, by moving size-- inside the loop
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Error Message: CHIPMemString.h:88:22: runtime error: null pointer passed as argument 2, which is declared to never be null when PI= is in mDNS TXT record (its value is empty) , and Dnssd::Internal::GetPairingInstruction calls CopyString, source is an empty bytespan and source.data() will return a null pointer, that will be passed to memcpy Fix: avoid memcpy in that case.
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PR #35580: Size comparison from a068855 to 557bdf9 Full report (82 builds for bl602, bl702, bl702l, cyw30739, efr32, esp32, linux, nrfconnect, nxp, psoc6, qpg, stm32, telink, tizen)
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saurabhst
approved these changes
Sep 17, 2024
yyzhong-g
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to yyzhong-g/connectedhomeip
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Dec 12, 2024
…35580) * Fix for unsigned integer overflow: Error Message: BufferWriter.cpp:76:16: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long') when size becomes 0 and we are in while (size-- > 0), then size will become less than 0, which should be avoided since it is an unsigned (although technically it wraps around, UBSAN complains about it). Fix: stop size from decrement past 0, by moving size-- inside the loop * Fix null pointer passed to non-null argument in CHIPMemString.h Error Message: CHIPMemString.h:88:22: runtime error: null pointer passed as argument 2, which is declared to never be null when PI= is in mDNS TXT record (its value is empty) , and Dnssd::Internal::GetPairingInstruction calls CopyString, source is an empty bytespan and source.data() will return a null pointer, that will be passed to memcpy Fix: avoid memcpy in that case.
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BufferWriter.cpp:76:16: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long')sizebecomes 0 and we are inwhile (size-- > 0), then size will become less than 0, which should be avoided since it is an unsigned (although technically it wraps around, UBSAN complains about it).size--inside the loopCHIPMemString.h:88:22: runtime error: null pointer passed as argument 2, which is declared to never be nullPI=is in mDNS TXT record (its value is empty) , andDnssd::Internal::GetPairingInstructioncallsCopyString,sourceis an empty bytespan andsource.data()will return a null pointer, that will be passed tomemcpyTo Reproduce