Ramon Roche 230cfe33ee fix(septentrio): bounds-check port name offset in detect_serial_port ...

The serial port autodetect computed an offset relative to a ">" prompt
without verifying that there were enough preceding bytes in the read
buffer. When the prompt landed near the start of the buffer the size_t
offset arithmetic underflowed and the subsequent copy read before the
buffer.

Replace the buffer_offset heuristic with a direct check that the prompt
sits at least four bytes into the read buffer before computing the port
name offset, and use signed pointer arithmetic on the address difference
so the underflow is no longer reachable.

Refs: GHSA-v78g-fxg8-gv3j
Signed-off-by: Ramon Roche <mrpollo@gmail.com>

2026-06-29 18:34:45 -07:00

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drivers

fix(septentrio): bounds-check port name offset in detect_serial_port

2026-06-29 18:34:45 -07:00

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