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-rw-r--r--mm/kmemleak.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f0fe4f2c1fa7..41df5b8efd25 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -195,6 +195,8 @@ static struct kmem_cache *scan_area_cache;
/* set if tracing memory operations is enabled */
static int kmemleak_enabled;
+/* same as above but only for the kmemleak_free() callback */
+static int kmemleak_free_enabled;
/* set in the late_initcall if there were no errors */
static int kmemleak_initialized;
/* enables or disables early logging of the memory operations */
@@ -942,7 +944,7 @@ void __ref kmemleak_free(const void *ptr)
{
pr_debug("%s(0x%p)\n", __func__, ptr);
- if (kmemleak_enabled && ptr && !IS_ERR(ptr))
+ if (kmemleak_free_enabled && ptr && !IS_ERR(ptr))
delete_object_full((unsigned long)ptr);
else if (kmemleak_early_log)
log_early(KMEMLEAK_FREE, ptr, 0, 0);
@@ -982,7 +984,7 @@ void __ref kmemleak_free_percpu(const void __percpu *ptr)
pr_debug("%s(0x%p)\n", __func__, ptr);
- if (kmemleak_enabled && ptr && !IS_ERR(ptr))
+ if (kmemleak_free_enabled && ptr && !IS_ERR(ptr))
for_each_possible_cpu(cpu)
delete_object_full((unsigned long)per_cpu_ptr(ptr,
cpu));
@@ -1750,6 +1752,13 @@ static void kmemleak_do_cleanup(struct work_struct *work)
mutex_lock(&scan_mutex);
stop_scan_thread();
+ /*
+ * Once the scan thread has stopped, it is safe to no longer track
+ * object freeing. Ordering of the scan thread stopping and the memory
+ * accesses below is guaranteed by the kthread_stop() function.
+ */
+ kmemleak_free_enabled = 0;
+
if (!kmemleak_found_leaks)
__kmemleak_do_cleanup();
else
@@ -1776,6 +1785,8 @@ static void kmemleak_disable(void)
/* check whether it is too early for a kernel thread */
if (kmemleak_initialized)
schedule_work(&cleanup_work);
+ else
+ kmemleak_free_enabled = 0;
pr_info("Kernel memory leak detector disabled\n");
}
@@ -1840,8 +1851,10 @@ void __init kmemleak_init(void)
if (kmemleak_error) {
local_irq_restore(flags);
return;
- } else
+ } else {
kmemleak_enabled = 1;
+ kmemleak_free_enabled = 1;
+ }
local_irq_restore(flags);
/*