On Fri, 26 Feb 2021 02:25:37 +0100 Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: > Currently, kasan_free_nondeferred_pages()->kasan_free_pages() is called > after debug_pagealloc_unmap_pages(). This causes a crash when > debug_pagealloc is enabled, as HW_TAGS KASAN can't set tags on an > unmapped page. > > This patch puts kasan_free_nondeferred_pages() before > debug_pagealloc_unmap_pages(). > > Besides fixing the crash, this also makes the annotation order consistent > with debug_pagealloc_map_pages() preceding kasan_alloc_pages(). > This bug exists in 5.12, does it not? If so, is cc:stable appropriate and if so, do we have a suitable Fixes: commit? Thanks.
