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perf tools: Fix segfault due to invalid kernel dso access

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Jiri reported that the commit 96d78059d6 ("perf tools: Make vmlinux
short name more like kallsyms short name") segfaults on perf script.

When processing kernel mmap event, it should access the 'kernel'
variable as sometimes it cannot find a matching dso from build-id table
so 'dso' might be invalid.

Reported-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1416285028-30572-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2014-11-18 13:30:28 +09:00 committed by Arnaldo Carvalho de Melo
parent 85c116a6cb
commit 330dfa224f
1 changed files with 2 additions and 2 deletions
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4
tools/perf/util/machine.c
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@ -1106,8 +1106,8 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
if (__machine__create_kernel_maps(machine, kernel) < 0)
goto out_problem;
if (strstr(dso->long_name, "vmlinux"))
dso__set_short_name(dso, "[kernel.vmlinux]", false);
if (strstr(kernel->long_name, "vmlinux"))
dso__set_short_name(kernel, "[kernel.vmlinux]", false);
machine__set_kernel_mmap_len(machine, event);