[tip:perf/urgent] perf symbols: Handle NULL dso in dso__name_len

[tip-bot for David Miller]

Commit-ID:  1e2dd2f73afdc810cc7400b7036232fbdc416eeb
Gitweb:     http://git.kernel.org/tip/1e2dd2f73afdc810cc7400b7036232fbdc416eeb
Author:     David Miller <davem@xxxxxxxxxxxxx>
AuthorDate: Sun, 25 Mar 2012 16:28:22 -0400
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 27 Mar 2012 11:00:58 -0300

perf symbols: Handle NULL dso in dso__name_len

We should use "[unknown]" in this case, in concert with the code in
_hist_entry__dso_snprintf().

Otherwise we'll crash when recomputing the histogram column lengths in
hists__calc_col_len().

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20120325.162822.2267799792062571623.davem@xxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/symbol.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index d9e995b..c0a028c 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -50,6 +50,8 @@ struct symbol_conf symbol_conf = {
 
 int dso__name_len(const struct dso *dso)
 {
+	if (!dso)
+		return strlen("[unknown]");
 	if (verbose)
 		return dso->long_name_len;
 
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