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| author | Namhyung Kim <namhyung.kim@lge.com> | 2013-04-01 20:35:17 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-05-28 16:23:52 +0300 |
| commit | 26353a61b977e57b58dd3555bc0422fea46c5ad6 (patch) | |
| tree | c6fe9a8d16effc5284ff44c1be0879e7adb8ad41 /tools/perf/util | |
| parent | 6956664a5c4c32d5aa48fe96d5e2421a3e3f72d5 (diff) | |
| download | linux-26353a61b977e57b58dd3555bc0422fea46c5ad6.tar.gz linux-26353a61b977e57b58dd3555bc0422fea46c5ad6.tar.bz2 linux-26353a61b977e57b58dd3555bc0422fea46c5ad6.zip | |
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/perf/util')
| -rw-r--r-- | tools/perf/util/hist.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index 6b32721f829a..9438d576459d 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) |