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Thomas GöttgensandAndrew Yong
6367132919
* Checksum NMEA sentences from the $ delimiter The PositionLite printWPL() format begins with a CRLF, so the fixed start offset of 1 folded the newline and the $ into the checksum and every sentence went out with a wrong value. Locate the $ instead and stop at the terminator or a \*. * Clamp truncated writes and harden the remaining fixed buffers snprintf returns the length it would have written, so a truncated NMEA sentence made buf + len point past the buffer and bufsz - len underflow into a huge size for the checksum append. Clamp after each write. Also pulls in the rest of #11236: the two remaining Dropzone sprintf calls, the dead strcpy in mt_sprintf that wrote one byte past a zero-size allocation for an empty format, and the 10-byte errcode buffer that INT32_MIN overflows. Co-Authored-By: Andrew Yong <me@ndoo.sg> * Bail out on a zero-sized buffer and cast err for %ld snprintf writes nothing at all when bufsz is 0, not even a terminator, so the checksum helper would run strchr over whatever the buffer already held. Return before touching it. int32_t is not long on every target, so cast before formatting with %ld. Co-Authored-By: Andrew Yong <me@ndoo.sg> * Add NMEA sentence regression tests Covers checksum computation from the $ delimiter for both printWPL overloads and printGGA, zero-sized buffers, and truncated buffers down to one byte. Co-Authored-By: Andrew Yong <me@ndoo.sg> * Tighten checksum parsing and pin the WPL fixture checksum Require exactly two hex digits followed by the sentence terminator, and assert both WPL overloads against a known checksum instead of comparing them to each other. * Bump native suite count to 43 --------- Co-authored-by: Andrew Yong <me@ndoo.sg>