From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+07392c132f11b1758ac3@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [mm?] [bcachefs?] UBSAN: shift-out-of-bounds in shmem_add_to_page_cache
Date: Wed, 5 Feb 2025 18:34:20 +0800 [thread overview]
Message-ID: <20250205103421.1895-1-hdanton@sina.com> (raw)
In-Reply-To: <67a23382.050a0220.d7c5a.00bd.GAE@google.com>
On Tue, 04 Feb 2025 07:34:26 -0800
> syzbot found the following issue on:
>
> HEAD commit: 69e858e0b8b2 Merge tag 'uml-for-linus-6.14-rc1' of git://g..
> git tree: upstream
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160983df980000
#syz test upstream master
--- x/lib/xarray.c
+++ y/lib/xarray.c
@@ -390,6 +390,7 @@ static void *xas_alloc(struct xa_state *
XA_NODE_BUG_ON(node, shift > BITS_PER_LONG);
XA_NODE_BUG_ON(node, !list_empty(&node->private_list));
node->shift = shift;
+ BUG_ON(shift > BITS_PER_LONG);
node->count = 0;
node->nr_values = 0;
RCU_INIT_POINTER(node->parent, xas->xa_node);
--
next prev parent reply other threads:[~2025-02-05 10:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-04 15:34 syzbot
2025-02-05 10:34 ` Hillf Danton [this message]
2025-02-05 10:51 ` syzbot
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