linux-kernel - [PATCH 3/4] trace-cmd: Handle opcode parsing error

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Date:	Mon, 25 Jul 2011 11:40:57 -0700
From:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Subject: [PATCH 3/4] trace-cmd: 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.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
---
 parse-events.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/parse-events.c b/parse-events.c
index 58ffe51..c62ca5a 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;
-- 
1.7.3.1

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