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e33711d5e7
build_id__snprintf() and hwmon_pmu__read_events() accumulate formatted output via snprintf(), which returns the would-have-been-written count on truncation. In build_id__snprintf(), this inflates the return value beyond the buffer size. In hwmon_pmu__read_events(), len overshoots out_buf_len and the next 'out_buf_len - len' underflows. Switch both to scnprintf() which returns actual bytes written. In build_id__snprintf(), also tighten the loop guard from 'offs < bf_size' to 'offs + 1 < bf_size': since scnprintf() returns at most size-1, offs never reaches bf_size, and the original condition would spin doing zero-byte writes once the buffer fills. Fixes:fccaaf6fbb("perf build-id: Change sprintf functions to snprintf") Fixes:53cc0b351e("perf hwmon_pmu: Add a tool PMU exposing events from hwmon in sysfs") Reported-by: sashiko-bot <sashiko-bot@kernel.org> Reviewed-by: Ian Rogers <irogers@google.com> Cc: Ian Rogers <irogers@google.com> Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
983 lines
23 KiB
983 lines
23 KiB