perf sort: Fix segfault with basic block 'cycles' sort dimension

Skip the sample which doesn't have branch_info to avoid segmentation
fault:

The fault can be reproduced by:

  perf record -a
  perf report -F cycles

Signed-off-by: Changbin Du <changbin.du@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 0e332f033a82 ("perf tools: Add support for cycles, weight branch_info field")
Link: http://lkml.kernel.org/r/20170313083148.23568-1-changbin.du@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index f8f16c0..93f755a 100644 (file)
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -846,6 +846,9 @@ static int hist_entry__mispredict_snprintf(struct hist_entry *he, char *bf,
 static int64_t
 sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right)
 {
+       if (!left->branch_info || !right->branch_info)
+               return cmp_null(left->branch_info, right->branch_info);
+
        return left->branch_info->flags.cycles -
                right->branch_info->flags.cycles;
 }
@@ -853,6 +856,8 @@ sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right)
 static int hist_entry__cycles_snprintf(struct hist_entry *he, char *bf,
                                    size_t size, unsigned int width)
 {
+       if (!he->branch_info)
+               return scnprintf(bf, size, "%-.*s", width, "N/A");
        if (he->branch_info->flags.cycles == 0)
                return repsep_snprintf(bf, size, "%-*s", width, "-");
        return repsep_snprintf(bf, size, "%-*hd", width,