From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
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.
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
Changes v2->v3:
- Added missing "../slab.h" include for accessing a kmem_cache field.
Changes v1->v2:
- This is a new patch.
---
mm/kasan/report_tags.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/kasan/report_tags.c b/mm/kasan/report_tags.c
index 78abdcde5da9..55154743f915 100644
--- a/mm/kasan/report_tags.c
+++ b/mm/kasan/report_tags.c
@@ -7,6 +7,7 @@
#include <linux/atomic.h>
#include "kasan.h"
+#include "../slab.h"
extern struct kasan_stack_ring stack_ring;
@@ -58,7 +59,8 @@ 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
