Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 77/77] perf script: Check session->header.env.arch before using it | Date | Mon, 1 Nov 2021 10:18:05 +0100 |
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From: Song Liu <songliubraving@fb.com>
commit 29c77550eef31b0d72a45b49eeab03b8963264e8 upstream.
When perf.data is not written cleanly, we would like to process existing data as much as possible (please see f_header.data.size == 0 condition in perf_session__read_header). However, perf.data with partial data may crash perf. Specifically, we see crash in 'perf script' for NULL session->header.env.arch.
Fix this by checking session->header.env.arch before using it to determine native_arch. Also split the if condition so it is easier to read.
Committer notes:
If it is a pipe, we already assume is a native arch, so no need to check session->header.env.arch.
Signed-off-by: Song Liu <songliubraving@fb.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: kernel-team@fb.com Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20211004053238.514936-1-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- tools/perf/builtin-script.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/tools/perf/builtin-script.c +++ b/tools/perf/builtin-script.c @@ -3820,11 +3820,15 @@ int cmd_script(int argc, const char **ar goto out_delete; uname(&uts); - if (data.is_pipe || /* assume pipe_mode indicates native_arch */ - !strcmp(uts.machine, session->header.env.arch) || - (!strcmp(uts.machine, "x86_64") && - !strcmp(session->header.env.arch, "i386"))) + if (data.is_pipe) { /* Assume pipe_mode indicates native_arch */ native_arch = true; + } else if (session->header.env.arch) { + if (!strcmp(uts.machine, session->header.env.arch)) + native_arch = true; + else if (!strcmp(uts.machine, "x86_64") && + !strcmp(session->header.env.arch, "i386")) + native_arch = true; + } script.session = session; script__setup_sample_type(&script);
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