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| author | Nikolay Kuratov <kniv@yandex-team.ru> | 2025-02-06 12:01:56 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-03-07 18:25:37 +0100 |
| commit | 746cc474a95473591853927b3a9792a2d671155b (patch) | |
| tree | 86aaeec2cc184e03864e224a78282bde4ef7da41 /scripts/stackusage | |
| parent | 435d2964af815aae456db554c62963b4515f19d0 (diff) | |
| download | linux-746cc474a95473591853927b3a9792a2d671155b.tar.gz linux-746cc474a95473591853927b3a9792a2d671155b.tar.bz2 linux-746cc474a95473591853927b3a9792a2d671155b.zip | |
ftrace: Avoid potential division by zero in function_stat_show()
commit a1a7eb89ca0b89dc1c326eeee2596f263291aca3 upstream.
Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64}
produce zero and skip stddev computation in that case.
For now don't care about rec->counter * rec->counter overflow because
rec->time * rec->time overflow will likely happen earlier.
Cc: stable@vger.kernel.org
Cc: Wen Yang <wenyang@linux.alibaba.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250206090156.1561783-1-kniv@yandex-team.ru
Fixes: e31f7939c1c27 ("ftrace: Avoid potential division by zero in function profiler")
Signed-off-by: Nikolay Kuratov <kniv@yandex-team.ru>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions