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Date: Mon, 10 Aug 2015 08:22:19 -0400 From: Dean Nelson <dnelson@...hat.com> To: a.p.zijlstra@...llo.org, mingo@...hat.com, rostedt@...dmis.org, acme@...nel.org Cc: namhyung@...nel.org, linux-kernel@...r.kernel.org, jolsa@...nel.org Subject: [PATCH v2] tools lib traceevent: add checks for returned EVENT_ERROR type Running the following perf-stat command on an arm64 system produces the following result... [root@...ch64 ~]# perf stat -e kmem:mm_page_alloc -a sleep 1 Warning: [kmem:mm_page_alloc] function sizeof not defined Warning: Error: expected type 4 but read 0 Segmentation fault [root@...ch64 ~]# The second warning message and SIGSEGV stem from the issue expressed in the first warning message, and are the result of ignoring the EVENT_ERROR type returned back through the call chain. Dealing with the first warning message is beyond the scope of this patch. But the second warning is addressed by this patch's first hunk. And the SIGSEGV is eliminated by its second hunk. Signed-off-by: Dean Nelson <dnelson@...hat.com> --- Changes in v2: - Moved the second hunk's check for EVENT_ERROR to a separate line. tools/lib/traceevent/event-parse.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index cc25f05..dafddc6 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -1680,6 +1680,9 @@ process_cond(struct event_format *event, struct print_arg *top, char **tok) type = process_arg(event, left, &token); again: + if (type == EVENT_ERROR) + goto out_free; + /* Handle other operations in the arguments */ if (type == EVENT_OP && strcmp(token, ":") != 0) { type = process_op(event, left, &token); @@ -1940,7 +1943,8 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok) type = process_arg_token(event, right, tok, type); - if (right->type == PRINT_OP && + if (type != EVENT_ERROR && + right->type == PRINT_OP && get_op_prio(arg->op.op) < get_op_prio(right->op.op)) { struct print_arg tmp; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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