From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 45FF53BFE3B; Thu, 15 Jan 2026 17:58:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768499880; cv=none; b=WmdsYzrR9+FPQF51/GC841NuT6zlDnHpAiauDfgOIAhT86/skXPUtINScMGUjTklxTbSc0F3x5DIG5qVrKog85qTboX2ZZ7Gr9ZFkeUxo2k4adFXYFdQZflSbsEV+tPLdGKh0HEE2NXN21XGbWsvSSzsTBLCR6ICS/1WZPOWYfo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768499880; c=relaxed/simple; bh=SczT44jpRwRnjmBQob2T/Q5ucqYysIMMiFTVB4o2Njg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VS9pZbLaKj6SWbJX9D8f5uBGx5dIIPuEYsJG6r68lQo7Dc9le7HJapLb3CYNM3jgUW0+NsN1liqYgF2tsI/IxoQk2TxUUFUuRLt9Y+HxF0SfmfDZJI2RcHBkRVVPMfJ2V3xnkXyXN+laTxzDqH2iZMYntC7+0sDfOkvgb+w2POk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=A2nrDPsy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="A2nrDPsy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBFFEC116D0; Thu, 15 Jan 2026 17:57:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768499880; bh=SczT44jpRwRnjmBQob2T/Q5ucqYysIMMiFTVB4o2Njg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A2nrDPsyOFk2n2FZ0Op2CwSV/iCZM7oLkBqun4gDPpmr6uN2MmSbNdPJPOCJ5wioI 6O+HrXdWws+F+/lJE/1P/syN1Q4tuZN2rOhXOI9f+VP/9o9VMP6iCM4vYcFAnPJbPE N7Opi0qYRJ0c6txEPqrKOk1a2yP/5Gsq+9EyuAzY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+e2ce9e275ecc70a30b72@syzkaller.appspotmail.com, Zhu Yanjun , Jason Gunthorpe , Sasha Levin , Ajay Kaher , Shivani Agarwal Subject: [PATCH 5.10 338/451] RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem Date: Thu, 15 Jan 2026 17:48:59 +0100 Message-ID: <20260115164243.122839438@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164230.864985076@linuxfoundation.org> References: <20260115164230.864985076@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhu Yanjun commit d0706bfd3ee40923c001c6827b786a309e2a8713 upstream. Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 strlen+0x93/0xa0 lib/string.c:420 __fortify_strlen include/linux/fortify-string.h:268 [inline] get_kobj_path_length lib/kobject.c:118 [inline] kobject_get_path+0x3f/0x2a0 lib/kobject.c:158 kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545 ib_register_device drivers/infiniband/core/device.c:1472 [inline] ib_register_device+0x8cf/0xe00 drivers/infiniband/core/device.c:1393 rxe_register_device+0x275/0x320 drivers/infiniband/sw/rxe/rxe_verbs.c:1552 rxe_net_add+0x8e/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:550 rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:225 nldev_newlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796 rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f This problem is similar to the problem that the commit 1d6a9e7449e2 ("RDMA/core: Fix use-after-free when rename device name") fixes. The root cause is: the function ib_device_rename() renames the name with lock. But in the function kobject_uevent(), this name is accessed without lock protection at the same time. The solution is to add the lock protection when this name is accessed in the function kobject_uevent(). Fixes: 779e0bf47632 ("RDMA/core: Do not indicate device ready when device enablement fails") Link: https://patch.msgid.link/r/20250506151008.75701-1-yanjun.zhu@linux.dev Reported-by: syzbot+e2ce9e275ecc70a30b72@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=e2ce9e275ecc70a30b72 Signed-off-by: Zhu Yanjun Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin [ Ajay: Modified to apply on v5.10.y-v6.6.y ib_device_notify_register() not present in v5.10.y-v6.6.y, so directly added lock for kobject_uevent() ] Signed-off-by: Ajay Kaher Signed-off-by: Shivani Agarwal Signed-off-by: Greg Kroah-Hartman --- drivers/infiniband/core/device.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -1396,8 +1396,13 @@ int ib_register_device(struct ib_device return ret; } dev_set_uevent_suppress(&device->dev, false); + + down_read(&devices_rwsem); + /* Mark for userspace that device is ready */ kobject_uevent(&device->dev.kobj, KOBJ_ADD); + + up_read(&devices_rwsem); ib_device_put(device); return 0;