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perf annotate: Check null of sym pointer before using it

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Sym may be NULL, and that will cause perf to crash.

Signed-off-by: Shan Wei <davidshan@tencent.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4FCD95D3.90209@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Samuel Liao 2012-06-05 13:14:59 +08:00 committed by Arnaldo Carvalho de Melo
parent dd4f52232c
commit c0a58fb2bd
1 changed files with 3 additions and 1 deletions
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4
tools/perf/ui/browsers/annotate.c
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@ -814,7 +814,7 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
{
struct disasm_line *pos, *n;
struct annotation *notes;
const size_t size = symbol__size(sym);
size_t size;
struct map_symbol ms = {
.map = map,
.sym = sym,
@ -834,6 +834,8 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map, int evidx,
if (sym == NULL)
return -1;
size = symbol__size(sym);
if (map->dso->annotate_warned)
return -1;