Similarly to 96fedce2 ("kasan: make tag based mode work with
CONFIG_HARDENED_USERCOPY"), we need to reset pointer tags in
__check_heap_object() in mm/slab.c before doing any pointer math.
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
mm/slab.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/slab.c b/mm/slab.c
index 78eb8c5bf4e4..c84458281a88 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4408,6 +4408,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
unsigned int objnr;
unsigned long offset;
+ ptr = kasan_reset_tag(ptr);
+
/* Find and validate object. */
cachep = page->slab_cache;
objnr = obj_to_index(cachep, page, (void *)ptr);
--
2.21.0.rc0.258.g878e2cd30e-goog
