From: Wang Nan <wangn...@huawei.com> 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 <wangn...@huawei.com> Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: Jiri Olsa <jo...@redhat.com> Cc: Zefan Li <lize...@huawei.com> Cc: pi3or...@163.com Link: http://lkml.kernel.org/r/1428490772-135393-1-git-send-email-wangn...@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/builtin-report.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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 && -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
