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.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
tools/perf/builtin-script.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 6211d0b84b7a6..7821f6740ac1d 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -4039,12 +4039,17 @@ 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;
+ 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);
--
2.30.2
