Tristan Hume 1d9093457b perf/x86/intel/pt: Fix crash with stop filters in single-range mode ... Add a check for !buf->single before calling pt_buffer_region_size in a place where a missing check can cause a kernel crash. Fixes a bug introduced by commit 670638477a ("perf/x86/intel/pt: Opportunistically use single range output mode"), which added a support for PT single-range output mode. Since that commit if a PT stop filter range is hit while tracing, the kernel will crash because of a null pointer dereference in pt_handle_status due to calling pt_buffer_region_size without a ToPA configured. The commit which introduced single-range mode guarded almost all uses of the ToPA buffer variables with checks of the buf->single variable, but missed the case where tracing was stopped by the PT hardware, which happens when execution hits a configured stop filter. Tested that hitting a stop filter while PT recording successfully records a trace with this patch but crashes without this patch. Fixes: 670638477a ("perf/x86/intel/pt: Opportunistically use single range output mode") Signed-off-by: Tristan Hume <tristan@thume.ca> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> Cc: stable@kernel.org Link: https://lkml.kernel.org/r/20220127220806.73664-1-tristan@thume.ca		2022-02-02 13:11:40 +01:00
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amd	x86/events/amd/iommu: Remove redundant assignment to variable shift	2021-12-28 21:30:05 +01:00
intel	perf/x86/intel/pt: Fix crash with stop filters in single-range mode	2022-02-02 13:11:40 +01:00
zhaoxin
core.c	Peter Zijlstra says:	2022-01-12 16:26:58 -08:00
Kconfig	perf/amd/uncore: Allow the driver to be built as a module	2021-08-26 09:14:36 +02:00
Makefile
msr.c	perf/x86/msr: Add Sapphire Rapids CPU support	2021-10-15 11:25:26 +02:00
perf_event.h	perf/x86/intel/lbr: Support LBR format V7	2022-01-18 12:09:48 +01:00
probe.c
probe.h
rapl.c	perf/x86/rapl: fix AMD event handling	2022-01-18 12:09:48 +01:00