From: Igor Lubashev <iluba...@akamai.com> commit e9a6882f267a8105461066e3ea6b4b6b9be1b807 upstream.
Check for ref_reloc_sym before using it instead of checking symbol_conf.kptr_restrict and relying solely on that check. Reported-by: Mathieu Poirier <mathieu.poir...@linaro.org> Signed-off-by: Igor Lubashev <iluba...@akamai.com> Tested-by: Mathieu Poirier <mathieu.poir...@linaro.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: Alexey Budankov <alexey.budan...@linux.intel.com> Cc: James Morris <jmor...@namei.org> Cc: Jiri Olsa <jo...@kernel.org> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Suzuki Poulouse <suzuki.poul...@arm.com> Cc: linux-arm-ker...@lists.infradead.org Link: http://lkml.kernel.org/r/1566869956-7154-2-git-send-email-iluba...@akamai.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Alexander Dahl <a...@thorsis.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- tools/perf/util/event.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -912,11 +912,13 @@ static int __perf_event__synthesize_kern int err; union perf_event *event; - if (symbol_conf.kptr_restrict) - return -1; if (map == NULL) return -1; + kmap = map__kmap(map); + if (!kmap->ref_reloc_sym) + return -1; + /* * We should get this from /sys/kernel/sections/.text, but till that is * available use this, and after it is use this as a fallback for older @@ -939,7 +941,6 @@ static int __perf_event__synthesize_kern event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; } - kmap = map__kmap(map); size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; size = PERF_ALIGN(size, sizeof(u64));
