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Thu, 02 Apr 2026 03:31:30 -0700 (PDT) MIME-Version: 1.0 References: <20260402081413.1896640-1-wangqing7171@gmail.com> In-Reply-To: <20260402081413.1896640-1-wangqing7171@gmail.com> From: Uladzislau Rezki Date: Thu, 2 Apr 2026 12:31:18 +0200 X-Gm-Features: AQROBzA-PGqhWZ0ZO8KgZ1kkbFT1mx268QVZUEEEA_yMVSYD8H4UyVKz4M06DDg Message-ID: Subject: Re: [PATCH] mm/vmalloc: fix KMSAN uninit-value warning in decay_va_pool_node() To: Qing Wang Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzbot+37b7f6cd519f7fb8d32a@syzkaller.appspotmail.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 830964000B X-Stat-Signature: oedpi65zsnuzm44y31xew7fsddu9p5yc X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1775125892-224246 X-HE-Meta: U2FsdGVkX190GVguThVq0urE4Lj56BD3psDwYPNyhFr3n1chDDmqNkrfF728jlf5bmuROPq9AtWDzruz/dBBPhm2ju+fU8ZrdUFTwQD0ng7r6FhJXnlP4RSKXRQe3nsRqb4F//ye8q9xJ8F6Y6NKXVupgom4HoTquROjgoB2NY8QIwL0azNuRkFbpXx+cS7xV/X+P3SEyAUigB/nXwyrXlduzU19EayoDuZNdLUt1qq/hJC2bpTq+LL1v7H5/NYDr5IhCWYEDjaZ2h+M64NtH34WcyTgOvz2pN5VIsJgigsb3eV8j4XzvkfyTaw9MB10khxOIMEHHj9aooTxWlesqxMpxMlE9HeKtXf5SJI0X7pLG05BakBMqua/D4SSxnlh6jZnqnU80RVzRue4DL3z0Vx1ZxeuZAWATnflM3FxVcXdNxg68xxBLqLsXZ4xk/jIbKq4tcC1FXTehBOyEZHqxssYBbTF/M+usOEKRqjUgWMiFUShvCAIYbGXvsYH8wciP+PpBNNAsM6EhBlQFvPfyrS3d0XFljI0GI0Ni4/sgRz+nzBurL/RWdfZvHx2FkWaZrPgRxuEqOlAZAEIPp5akHkGxhGjgQkrug23o6vWBn7zHtT1fAa83zuzv6oA8tanQDkxs36MiKpfC6rwRLZRHE5iydDFgAI91w0gKWcri1V7Zh1mgBRXz8dmFRVVIivHCdXCBgm5wPp24KdYx1XZ29kx0ervMiLw81iI0F9+4H33WuvQHBiNKXgl2JsjdS/3Lp6MS/yq7ldnWKg7QIRadviwczZuhdCiPzIgNOAcLbE0lQW68b+w6YVyKC7LXkMJldUJb44O14mEZildhxUW6olmYcJlsLS2wrqDkuJnGJ9+0JsmYwQH2pGNbOzmtYKDf7UlRUWURAE0Yuuj6r77hI6lxCSgHjep6RtWpQT0c8eEUiNnpBy6oa8AAECsRo/toAMTYHO9etUP7EW2rjE wwHCH2hd 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, Qing Wang! Let me check it close! On Thu, Apr 2, 2026 at 10:14=E2=80=AFAM Qing Wang = wrote: > > 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 [= inline] > BUG: KMSAN: uninit-value in list_del_init include/linux/list.h:295 [inl= ine] > 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 uninitiali= zed. > > 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 l= ong size, > * to avoid false negatives. > */ > kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask); > + INIT_LIST_HEAD(&va->list); > } > > retry: > -- > 2.34.1 > --=20 Uladzislau Rezki