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| author | Wang Nan <wangnan0@huawei.com> | 2015-04-08 10:59:32 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-08 11:00:00 -0300 |
| commit | f6fcc1433a4a9057b2977313f31eadbc1c84268b (patch) | |
| tree | c0c14964dd8bb24927a53be2c893ad6fb684f7b7 /tools | |
| parent | 54a50f93eb13ab5efa7366627534e2b0f7caa8e5 (diff) | |
| download | lwn-f6fcc1433a4a9057b2977313f31eadbc1c84268b.tar.gz lwn-f6fcc1433a4a9057b2977313f31eadbc1c84268b.zip | |
perf report: Don't call map__kmap if map is NULL.
report__warn_kptr_restrict() calls map__kmap(kernel_map) before checking
kernel_map againest NULL.
Which is dangerous, since map__kmap() will return a invalid and not NULL
address.
It will trigger a warning message in map__kmap() after the patch "perf:
kmaps: enforce usage of kmaps to protect futher bugs." was applied.
This patch fixes it by adding the missing checking.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1428490772-135393-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-report.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index b5b2ad4ca9c4..476cdf7afcca 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -347,7 +347,7 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist, static void report__warn_kptr_restrict(const struct report *rep) { struct map *kernel_map = rep->session->machines.host.vmlinux_maps[MAP__FUNCTION]; - struct kmap *kernel_kmap = map__kmap(kernel_map); + struct kmap *kernel_kmap = kernel_map ? map__kmap(kernel_map) : NULL; if (kernel_map == NULL || (kernel_map->dso->hit && |