parse-events: Handle opcode parsing error

If an invalid opcode is encountered in parsing event print format, the
trace-cmd calls exit() without parsing any other events.

This patch adds handling for such an error where the get_op_prio() is
called. If the return value is -1, then the event print format parsing
is skipped and parsing continues.

Cc: Michael Rubin <mrubin@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Link: http://lkml.kernel.org/r/1311619257-4970-1-git-send-email-vnagarnaik@google.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 11 insertions, 8 deletions

diff --git a/parse-events.c b/parse-events.c
index 32c13ac..8cec1ea 100644
--- a/parse-events.c
+++ b/parse-events.c
@@ -1588,7 +1588,7 @@ static int get_op_prio(char *op)
                 case '?':
                         return 16;
                 default:
-                        die("unknown op '%c'", op[0]);
+                        do_warning("unknown op '%c'", op[0]);
                         return -1;
                 }
         } else {
@@ -1609,22 +1609,22 @@ static int get_op_prio(char *op)
                 } else if (strcmp(op, "||") == 0) {
                         return 15;
                 } else {
-                        die("unknown op '%s'", op);
+                        do_warning("unknown op '%s'", op);
                         return -1;
                 }
         }
 }
 
-static void set_op_prio(struct print_arg *arg)
+static int set_op_prio(struct print_arg *arg)
 {
 
         /* single ops are the greatest */
-        if (!arg->op.left || arg->op.left->type == PRINT_NULL) {
+        if (!arg->op.left || arg->op.left->type == PRINT_NULL)
                 arg->op.prio = 0;
-                return;
-        }
+        else
+                arg->op.prio = get_op_prio(arg->op.op);
 
-        arg->op.prio = get_op_prio(arg->op.op);
+        return arg->op.prio;
 }
 
 /* Note, *tok does not get freed, but will most likely be saved */
@@ -1706,7 +1706,10 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
                 arg->op.op = token;
                 arg->op.left = left;
 
-                set_op_prio(arg);
+                if (set_op_prio(arg) == -1) {
+                        event->flags |= EVENT_FL_FAILED;
+                        goto out_free;
+                }
 
                 type = read_token_item(&token);
                 *tok = token;