ftrace: Fix uninitialized variable in match_records()

BugLink: http://bugs.launchpad.net/bugs/1707233
commit 2e028c4fe12907f226b8221815f16c2486ad3aa7 upstream.

My static checker complains that if "func" is NULL then "clear_filter"
is uninitialized.  This seems like it could be true, although it's
possible something subtle is happening that I haven't seen.

    kernel/trace/ftrace.c:3844 match_records()
    error: uninitialized symbol 'clear_filter'.

Link: http://lkml.kernel.org/r/20170712073556.h6tkpjcdzjaozozs@mwanda
Fixes: f0a3b154bd7 ("ftrace: Clarify code for mod command")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 34b2a0d5cf1a5b90463f46d46811eed202194282..eba904bae48cef2cbf9dfcc2f98f0c1ff3b2e4ea 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3535,7 +3535,7 @@ match_records(struct ftrace_hash *hash, char *func, int len, char *mod)
        int exclude_mod = 0;
        int found = 0;
        int ret;
-       int clear_filter;
+       int clear_filter = 0;
 
        if (func) {
                func_g.type = filter_parse_regex(func, len, &func_g.search,