From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756004Ab0GVVFR (ORCPT ); Thu, 22 Jul 2010 17:05:17 -0400 Received: from mail3.caviumnetworks.com ([12.108.191.235]:10343 "EHLO mail3.caviumnetworks.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752115Ab0GVVFN (ORCPT ); Thu, 22 Jul 2010 17:05:13 -0400 From: David Daney To: rostedt@goodmis.org Cc: linux-kernel@vger.kernel.org, David Daney Subject: [PATCH] trace-cmd: Don't SIGSEGV when event field format cannot be parsed (v2). Date: Thu, 22 Jul 2010 14:05:05 -0700 Message-Id: <1279832705-14219-1-git-send-email-ddaney@caviumnetworks.com> X-Mailer: git-send-email 1.7.1.1 In-Reply-To: <1279829325.3319.27.camel@gandalf.stny.rr.com> References: <1279829325.3319.27.camel@gandalf.stny.rr.com> X-OriginalArrivalTime: 22 Jul 2010 21:05:13.0223 (UTC) FILETIME=[93AE1170:01CB29E1] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>From the MIPS kernel we get things like: print fmt: "page=%p pfn=%lu order=%d migratetype=%d", REC->page, ({ struct page *__pg = (REC->page); int __sec = page_to_section(__pg); (unsigned long)(__pg - __section_mem_map_addr(__nr_to_section(__sec))); }), REC->order, REC->migratetype This cannot be parsed, leading to a NULL struct event_format* being passed to pevent_get_common_field_val, which produces a SIGSEGV. It would be good to get a parsable format from the kernel, but to remediate the problem for legacy kernels, we can just return an error indicator in this case. This allows some output from trace-cmd report, although perhaps with some missing data. But this is better than crashing. (v2): Do the check in all pevent_get_* Signed-off-by: David Daney --- parse-events.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/parse-events.c b/parse-events.c index 1e854e2..595ba90 100644 --- a/parse-events.c +++ b/parse-events.c @@ -4464,6 +4464,9 @@ int pevent_get_field_val(struct trace_seq *s, struct event_format *event, { struct format_field *field; + if (!event) + return -1; + field = pevent_find_field(event, name); return get_field_val(s, field, name, record, val, err); @@ -4486,6 +4489,9 @@ int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event, { struct format_field *field; + if (!event) + return -1; + field = pevent_find_common_field(event, name); return get_field_val(s, field, name, record, val, err); @@ -4508,6 +4514,9 @@ int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event, { struct format_field *field; + if (!event) + return -1; + field = pevent_find_any_field(event, name); return get_field_val(s, field, name, record, val, err); -- 1.7.1.1