[tip:perf/core] perf annotate: Check null of sym pointer before using it

[tip-bot for Samuel Liao <samuelliao@tencent.com>]

Commit-ID:  c0a58fb2bdf033df433cad9009c7dac4c6b872b0
Gitweb:     http://git.kernel.org/tip/c0a58fb2bdf033df433cad9009c7dac4c6b872b0
Author:     Samuel Liao <samuelliao@tencent.com>
AuthorDate: Tue, 5 Jun 2012 13:14:59 +0800
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 19 Jun 2012 14:30:26 -0300

perf annotate: Check null of sym pointer before using it

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>
---
 tools/perf/ui/browsers/annotate.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 34b1c46..67a2703 100644
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -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;