[tip:tracing/urgent] tracing/filters: Fix MATCH_END_ONLY filter matching

[tip-bot for Li Zefan]

Commit-ID:  a3291c14ecf0a995e30d993b7f2cae031de98727
Gitweb:     http://git.kernel.org/tip/a3291c14ecf0a995e30d993b7f2cae031de98727
Author:     Li Zefan <lizf@xxxxxxxxxxxxxx>
AuthorDate: Thu, 14 Jan 2010 10:53:41 +0800
Committer:  Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Thu, 14 Jan 2010 22:38:07 -0500

tracing/filters: Fix MATCH_END_ONLY filter matching

For '*foo' pattern, we should allow any string ending with
'foo', but event filtering incorrectly disallows strings
like bar_foo_foo:

Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
LKML-Reference: <4B4E8735.6070604@xxxxxxxxxxxxxx>
Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 kernel/trace/trace_events_filter.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 11c3973..49e44dd 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -275,9 +275,10 @@ static int regex_match_middle(char *str, struct regex *r, int len)
 
 static int regex_match_end(char *str, struct regex *r, int len)
 {
-	char *ptr = strstr(str, r->pattern);
+	int strlen = len - 1;
 
-	if (ptr && (ptr[r->len] == 0))
+	if (strlen >= r->len &&
+	    memcmp(str + strlen - r->len, r->pattern, r->len) == 0)
 		return 1;
 	return 0;
 }
--
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