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perf script: Check session->header.env.arch before using it

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commit 29c77550ee 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>
This commit is contained in:
Song Liu 2021-10-03 22:32:38 -07:00 committed by Greg Kroah-Hartman
parent 6f416815c5
commit fbb91dadb5
1 changed files with 8 additions and 4 deletions
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12
tools/perf/builtin-script.c
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@ -3820,11 +3820,15 @@ int cmd_script(int argc, const char **argv)
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);