perf machine: Reset errno before strtol in guest kernel map creation

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machines__create_guest_kernel_maps() checks errno == ERANGE after
strtol() to detect overflow, but does not clear errno first.  A stale
ERANGE from an earlier library call (e.g. scandir internals) causes
valid numeric directory names to be incorrectly skipped.

Set errno = 0 before strtol() so only the current conversion can
trigger the ERANGE check.

Fixes: a1645ce12a ("perf: 'perf kvm' tool for monitoring guest performance from host")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: Zhang, Yanmin <yanmin_zhang@linux.intel.com>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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Arnaldo Carvalho de Melo 2026-07-26 20:40:12 -03:00 • committed by Namhyung Kim

parent b687e1a418

commit 29ec46e43f

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tools/perf/util/machine.c

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