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authorNamhyung Kim <namhyung.kim@lge.com>2013-04-01 20:35:17 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-05-28 16:23:52 +0300
commit26353a61b977e57b58dd3555bc0422fea46c5ad6 (patch)
treec6fe9a8d16effc5284ff44c1be0879e7adb8ad41 /tools
parent6956664a5c4c32d5aa48fe96d5e2421a3e3f72d5 (diff)
downloadop-kernel-dev-26353a61b977e57b58dd3555bc0422fea46c5ad6.zip
op-kernel-dev-26353a61b977e57b58dd3555bc0422fea46c5ad6.tar.gz
perf hists: Fix an invalid memory free on he->branch_info
The branch info was allocated for the whole stack and passed matching hist entry for each level during processing samples. Thus when a hist entry tries to free its branch info like in hists__collapse_insert_entry it'll face following error. *** glibc detected *** perf: munmap_chunk(): invalid pointer: 0x00000000014e9d20 *** ======= Backtrace: ========= /lib64/libc.so.6[0x387d47ae16] perf[0x4923bd] perf(cmd_report+0xd68)[0x432a08] perf[0x41a663] perf(main+0x58f)[0x419eaf] /lib64/libc.so.6(__libc_start_main+0xf5)[0x387d421735] perf[0x419f95] Fix it by allocating and copying branch info for each new hist entry. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1364816125-12212-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-report.c9
-rw-r--r--tools/perf/util/hist.c14
2 files changed, 20 insertions, 3 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index bd0ca81..d9f2de3 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -187,6 +187,9 @@ static int perf_report__add_branch_hist_entry(struct perf_tool *tool,
for (i = 0; i < sample->branch_stack->nr; i++) {
if (rep->hide_unresolved && !(bi[i].from.sym && bi[i].to.sym))
continue;
+
+ err = -ENOMEM;
+
/*
* The report shows the percentage of total branches captured
* and not events sampled. Thus we use a pseudo period of 1.
@@ -195,7 +198,6 @@ static int perf_report__add_branch_hist_entry(struct perf_tool *tool,
&bi[i], 1, 1);
if (he) {
struct annotation *notes;
- err = -ENOMEM;
bx = he->branch_info;
if (bx->from.sym && use_browser == 1 && sort__has_sym) {
notes = symbol__annotation(bx->from.sym);
@@ -226,11 +228,12 @@ static int perf_report__add_branch_hist_entry(struct perf_tool *tool,
}
evsel->hists.stats.total_period += 1;
hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
- err = 0;
} else
- return -ENOMEM;
+ goto out;
}
+ err = 0;
out:
+ free(bi);
return err;
}
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 6b32721..9438d57 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -292,6 +292,20 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template)
he->ms.map->referenced = true;
if (he->branch_info) {
+ /*
+ * This branch info is (a part of) allocated from
+ * machine__resolve_bstack() and will be freed after
+ * adding new entries. So we need to save a copy.
+ */
+ he->branch_info = malloc(sizeof(*he->branch_info));
+ if (he->branch_info == NULL) {
+ free(he);
+ return NULL;
+ }
+
+ memcpy(he->branch_info, template->branch_info,
+ sizeof(*he->branch_info));
+
if (he->branch_info->from.map)
he->branch_info->from.map->referenced = true;
if (he->branch_info->to.map)
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