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authorTom Zanussi <tzanussi@gmail.com>2009-03-23 03:26:42 -0500
committerIngo Molnar <mingo@elte.hu>2009-03-23 09:30:36 +0100
commitee6cdabc820a29bd607f38d9cb335c3ceddc673b (patch)
treebc4cbebd9abc679bb12b10d19f8ab9a7a23689dd /kernel
parent75c8b417526529d0a7072e4d93ec99dbd483a6f4 (diff)
tracing/filters: fix bug in copy_pred()
Impact: fix potential crash on subsystem filter expression freeing When making a copy of the predicate, pred->field_name needs to be duplicated in the copy as well, otherwise bad things can happen due to later multiple frees of the same string. This affects only per-subsystem event filtering. Signed-off-by: Tom Zanussi <tzanussi@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com> LKML-Reference: <1237796802.7527.39.camel@charm-linux> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_filter.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index c4a413b70f7..fd01d8022ad 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -276,11 +276,19 @@ static struct filter_pred *copy_pred(struct filter_pred *pred)
return NULL;
memcpy(new_pred, pred, sizeof(*pred));
+
+ if (pred->field_name) {
+ new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
+ if (!new_pred->field_name) {
+ kfree(new_pred);
+ return NULL;
+ }
+ }
+
if (pred->str_val) {
new_pred->str_val = kstrdup(pred->str_val, GFP_KERNEL);
- new_pred->field_name = kstrdup(pred->field_name, GFP_KERNEL);
if (!new_pred->str_val) {
- kfree(new_pred);
+ filter_free_pred(new_pred);
return NULL;
}
}