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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2021-02-02 08:23:26 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-02-02 15:32:02 +0100 |
| commit | c8b186a8d54d7e12d28e9f9686cb00ff18fc2ab2 (patch) | |
| tree | 80a96646eed83f2690c2d8ac596b04d009b69ace /COPYING | |
| parent | kretprobe: Avoid re-registration of the same kretprobe earlier (diff) | |
| download | linux-c8b186a8d54d7e12d28e9f9686cb00ff18fc2ab2.tar.xz linux-c8b186a8d54d7e12d28e9f9686cb00ff18fc2ab2.zip | |
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/20210202072326.120557-1-aik@ozlabs.ru
Cc: stable@vger.kernel.org
Fixes: d25e37d89dd2f ("tracepoint: Optimize using static_call()")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions