perf event: Check ref_reloc_sym before using it

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.poirier@linaro.org>
Signed-off-by: Igor Lubashev <ilubashe@akamai.com>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1566869956-7154-2-git-send-email-ilubashe@akamai.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 33616ea62a4794d7096729279dc1a41c6d80e7f7..e33dd1a040cc0e91adfa12619cb5a66761aae995 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -913,11 +913,13 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
        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
@@ -940,7 +942,6 @@ static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
                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));