[PATCH v2 18/19] kasan: check object_size in kasan_complete_mode_report_info

andrey.konovalov
2023-09-13T17:18:48Z

From: Andrey Konovalov <andreyknvl@google.com>

Check the object size when looking up entries in the stack ring.

If the size of the object for which a report is being printed does not
match the size of the object for which a stack trace has been saved in
the stack ring, the saved stack trace is irrelevant.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>

---

Changes v1->v2:
- This is a new patch.
---
mm/kasan/report_tags.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/report_tags.c b/mm/kasan/report_tags.c
index 78abdcde5da9..98c238ba3545 100644
--- a/mm/kasan/report_tags.c
+++ b/mm/kasan/report_tags.c
@@ -58,7 +58,8 @@ void kasan_complete_mode_report_info(struct kasan_report_info *info)
entry = &stack_ring.entries[i % stack_ring.size];

if (kasan_reset_tag(entry->ptr) != info->object ||
- get_tag(entry->ptr) != get_tag(info->access_addr))
+ get_tag(entry->ptr) != get_tag(info->access_addr) ||
+ info->cache->object_size != entry->size)
continue;

if (entry->is_free) {
--
2.25.1