kmemleak: Only scan non-zero-size areas

Kmemleak should only track valid scan areas with a non-zero size.
Otherwise, such area may reside just at the end of an object and
kmemleak would report "Adding scan area to unknown object".

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index c833add..f9f7310 100644 (file)
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1036,7 +1036,7 @@ void __ref kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp)
 {
        pr_debug("%s(0x%p)\n", __func__, ptr);
 
-       if (atomic_read(&kmemleak_enabled) && ptr && !IS_ERR(ptr))
+       if (atomic_read(&kmemleak_enabled) && ptr && size && !IS_ERR(ptr))
                add_scan_area((unsigned long)ptr, size, gfp);
        else if (atomic_read(&kmemleak_early_log))
                log_early(KMEMLEAK_SCAN_AREA, ptr, size, 0);