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Thu, 02 Apr 2026 01:14:22 -0700 (PDT) Received: from lima-ubuntu.hz.ali.com ([47.246.98.210]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b274979d72sm19685155ad.51.2026.04.02.01.14.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 01:14:22 -0700 (PDT) From: Qing Wang To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qing Wang , syzbot+37b7f6cd519f7fb8d32a@syzkaller.appspotmail.com Subject: [PATCH] mm/vmalloc: fix KMSAN uninit-value warning in decay_va_pool_node() Date: Thu, 2 Apr 2026 16:14:13 +0800 Message-Id: <20260402081413.1896640-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" KMSAN reported an uninit-value warning when accessing vmap_area->list in decay_va_pool_node(): BUG: KMSAN: uninit-value in __list_del_entry_valid include/linux/list.h:-= 1 [inline] BUG: KMSAN: uninit-value in __list_del_entry include/linux/list.h:223 [in= line] BUG: KMSAN: uninit-value in list_del_init include/linux/list.h:295 [inlin= e] BUG: KMSAN: uninit-value in decay_va_pool_node+0xf78/0x1dd0 mm/vmalloc.c:= 2255 Uninit was created at: kmem_cache_alloc_node_noprof+0x3cd/0x12d0 mm/slub.c:4918 alloc_vmap_area+0x327/0x2e30 mm/vmalloc.c:2065 The root cause is that if node_alloc() fail and the va is allocated via kmem_cache_alloc_node() by alloc_vmap_area(), va->list will be uninitialize= d. Fix this by explicitly initializing va->list after allocation. Reported-by: syzbot+37b7f6cd519f7fb8d32a@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D37b7f6cd519f7fb8d32a Signed-off-by: Qing Wang --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 61caa55a4402..8aebbb51e178 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2071,6 +2071,7 @@ static struct vmap_area *alloc_vmap_area(unsigned lon= g size, * to avoid false negatives. */ kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask); + INIT_LIST_HEAD(&va->list); } =20 retry: --=20 2.34.1