Hello Alexander Shishkin,
This is a semi-automatic email about new static checker warnings.
The patch 375637bc5249: "perf/core: Introduce address range
filtering" from Apr 27, 2016, leads to the following Smatch complaint:
kernel/events/core.c:3865 _free_event()
warn: variable dereferenced before check 'event->pmu' (see line 3856)
kernel/events/core.c
3855 perf_event_free_bpf_prog(event);
3856 perf_addr_filters_splice(event, NULL);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
New code adds an unchecked "event->pmu" dereference inside function.
3857 kfree(event->addr_filters_offs);
3858
3859 if (event->destroy)
3860 event->destroy(event);
3861
3862 if (event->ctx)
3863 put_ctx(event->ctx);
3864
3865 if (event->pmu) {
^^^^^^^^^^
Existing code assumes this can be NULL.
3866 exclusive_event_destroy(event);
3867 module_put(event->pmu->module);
regards,
dan carpenter
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