ftrace: Avoid potential division by zero in function profiler

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The ftrace_profile->counter is unsigned long and
do_div truncates it to 32 bits, which means it can test
non-zero and be truncated to zero for division.
Fix this issue by using div64_ul() instead.

Link: http://lkml.kernel.org/r/20200103030248.14516-1-wenyang@linux.alibaba.com

Cc: stable@vger.kernel.org
Fixes: e330b3bcd8 ("tracing: Show sample std dev in function profiling")
Fixes: 34886c8bc5 ("tracing: add average time in function to function profiler")
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Wen Yang 2020-01-03 11:02:48 +08:00 • committed by Steven Rostedt (VMware)

parent b8299d362d

commit e31f7939c1

1 changed files with 3 additions and 3 deletions

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kernel/trace/ftrace.c

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