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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2013-05-14 15:40:48 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-19 11:38:25 -0700
commit23b929f9c3313a106ca9481b374fd45e41152a33 (patch)
tree1ac01cade0ec6ae8f819fc502a13731ded0d290d /kernel
parentc25c0eb5e30cb3666f8d8d75f4994383ac361592 (diff)
tracing: Fix leaks of filter preds
commit 60705c89460fdc7227f2d153b68b3f34814738a4 upstream. Special preds are created when folding a series of preds that can be done in serial. These are allocated in an ops field of the pred structure. But they were never freed, causing memory leaks. This was discovered using the kmemleak checker: unreferenced object 0xffff8800797fd5e0 (size 32): comm "swapper/0", pid 1, jiffies 4294690605 (age 104.608s) hex dump (first 32 bytes): 00 00 01 00 03 00 05 00 07 00 09 00 0b 00 0d 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff814b52af>] kmemleak_alloc+0x73/0x98 [<ffffffff8111ff84>] kmemleak_alloc_recursive.constprop.42+0x16/0x18 [<ffffffff81120e68>] __kmalloc+0xd7/0x125 [<ffffffff810d47eb>] kcalloc.constprop.24+0x2d/0x2f [<ffffffff810d4896>] fold_pred_tree_cb+0xa9/0xf4 [<ffffffff810d3781>] walk_pred_tree+0x47/0xcc [<ffffffff810d5030>] replace_preds.isra.20+0x6f8/0x72f [<ffffffff810d50b5>] create_filter+0x4e/0x8b [<ffffffff81b1c30d>] ftrace_test_event_filter+0x5a/0x155 [<ffffffff8100028d>] do_one_initcall+0xa0/0x137 [<ffffffff81afbedf>] kernel_init_freeable+0x14d/0x1dc [<ffffffff814b24b7>] kernel_init+0xe/0xdb [<ffffffff814d539c>] ret_from_fork+0x7c/0xb0 [<ffffffffffffffff>] 0xffffffffffffffff Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_events_filter.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e5b0ca8b8d4d..5a8a53e67f8f 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -777,7 +777,11 @@ static int filter_set_pred(struct event_filter *filter,
static void __free_preds(struct event_filter *filter)
{
+ int i;
+
if (filter->preds) {
+ for (i = 0; i < filter->n_preds; i++)
+ kfree(filter->preds[i].ops);
kfree(filter->preds);
filter->preds = NULL;
}