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| author | Wen Yang <wenyang@linux.alibaba.com> | 2020-01-03 11:02:48 +0800 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-02 22:14:57 -0500 |
| commit | e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d (patch) | |
| tree | 7e57560cc349e3336dd9033726bc429f5ee4adae /include | |
| parent | b8299d362d0837ae39e87e9019ebe6b736e0f035 (diff) | |
ftrace: Avoid potential division by zero in function profiler
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: e330b3bcd8319 ("tracing: Show sample std dev in function profiling")
Fixes: 34886c8bc590f ("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>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions