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tools lib traceevent: Add checks for returned EVENT_ERROR type

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Running the following perf-stat command on an arm64 system produces the
following result...

  [root@aarch64 ~]# 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@aarch64 ~]#

The second warning was a result of the first warning not stopping
processing after it detected the issue.

That is, code that found the issue reported the first problem, but
because it did not exit out of the functions smoothly, it caused the
other warning to appear and not only that, it later caused the SIGSEGV.

Signed-off-by: Dean Nelson <dnelson@redhat.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20150820151632.13927.13791.email-sent-by-dnelson@teal
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Dean Nelson 2015-08-20 11:16:32 -04:00 committed by Arnaldo Carvalho de Melo
parent 81cd60cc29
commit 6f56e9cf58
1 changed files with 9 additions and 0 deletions
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9
tools/lib/traceevent/event-parse.c
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@ -1745,6 +1745,9 @@ 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);
@ -2004,6 +2007,12 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
goto out_warn_free;
type = process_arg_token(event, right, tok, type);
if (type == EVENT_ERROR) {
free_arg(right);
/* token was freed in process_arg_token() via *tok */
token = NULL;
goto out_free;
}
if (right->type == PRINT_OP &&
get_op_prio(arg->op.op) < get_op_prio(right->op.op)) {