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| author | Alexey Kardashevskiy <[email protected]> | 2021-02-02 18:23:26 +1100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <[email protected]> | 2021-02-02 09:32:02 -0500 |
| commit | c8b186a8d54d7e12d28e9f9686cb00ff18fc2ab2 (patch) | |
| tree | 80a96646eed83f2690c2d8ac596b04d009b69ace /tools/perf/util/scripting-engines/trace-event-perl.c | |
| parent | 0188b87899ffc4a1d36a0badbe77d56c92fd91dc (diff) | |
tracepoint: Fix race between tracing and removing tracepoint
When executing a tracepoint, the tracepoint's func is dereferenced twice -
in __DO_TRACE() (where the returned pointer is checked) and later on in
__traceiter_##_name where the returned pointer is dereferenced without
checking which leads to races against tracepoint_removal_sync() and
crashes.
This adds a check before referencing the pointer in tracepoint_ptr_deref.
Link: https://lkml.kernel.org/r/[email protected]
Cc: [email protected]
Fixes: d25e37d89dd2f ("tracepoint: Optimize using static_call()")
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Alexey Kardashevskiy <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-perl.c')
0 files changed, 0 insertions, 0 deletions