From: Hidayathulla Khan I <hidayath@linux.ibm.com>
To: Alexandra Winter <wintera@linux.ibm.com>,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, alibuda@linux.alibaba.com,
dust.li@linux.alibaba.com, sidraya@linux.ibm.com,
wenjia@linux.ibm.com, mjambigi@linux.ibm.com,
Rahul Chandelkar <rc@rexion.ai>
Cc: tonylu@linux.alibaba.com, guwen@linux.alibaba.com,
horms@kernel.org, hca@linux.ibm.com, gor@linux.ibm.com,
agordeev@linux.ibm.com, borntraeger@linux.ibm.com,
svens@linux.ibm.com, pasic@linux.ibm.com, gbayer@linux.ibm.com,
andrew+netdev@lunn.ch, netdev@vger.kernel.org,
linux-s390@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] dibs: fix use-after-free of dmb_node in loopback attach/detach/unregister
Date: Wed, 29 Jul 2026 18:20:00 +0530 [thread overview]
Message-ID: <9d2d6c92-2d5c-4b12-af1e-78062da8730f@linux.ibm.com> (raw)
In-Reply-To: <fedb6ecd-f5e4-4830-9595-237215fa0164@linux.ibm.com>
On 29/07/26 5:55 pm, Alexandra Winter wrote:
>
> On 27.07.26 11:35, Hidayath Khan wrote:
>> dibs_lo_attach_dmb(), dibs_lo_detach_dmb() and dibs_lo_unregister_dmb()
>> look up the dmb_node under dmb_ht_lock, drop the lock and only then
>> operate on the node's refcount. Nothing keeps the node alive across
>> that window: __dibs_lo_unregister_dmb() removes the node from the hash
>> table under the write lock and immediately frees it.
>>
> I had lost track of this, but Rahul Chandelkar had already proposed a
> similar patch [1] for this issue, but never followed up with a v2.
>
> Rahul, Hidayath,
> Would it be ok for both of you to add
> Reported-by: Rahul Chandelkar <rc@rexion.ai>
Sure, happy to add Reported-by: Rahul Chandelkar <rc@rexion.ai> in v2.
>
>
> [1] https://lore.kernel.org/netdev/4gRZFl1CWvz2x9j@mail.spacemail.com/
>
next prev parent reply other threads:[~2026-07-29 12:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-27 9:35 [PATCH net] dibs: fix use-after-free of dmb_node in loopback attach/detach/unregister Hidayath Khan
2026-07-29 12:25 ` Alexandra Winter
2026-07-29 12:50 ` Hidayathulla Khan I [this message]
2026-07-30 0:00 ` patchwork-bot+netdevbpf
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