From: patchwork-bot+netdevbpf@kernel.org
To: Dipayaan Roy <dipayanroy@linux.microsoft.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
leon@kernel.org, longli@microsoft.com, kotaranov@microsoft.com,
horms@kernel.org, shradhagupta@linux.microsoft.com,
ssengar@linux.microsoft.com, ernis@linux.microsoft.com,
shirazsaleem@microsoft.com, linux-hyperv@vger.kernel.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rdma@vger.kernel.org, stephen@networkplumber.org,
dipayanroy@microsoft.com
Subject: Re: [PATCH net,v2] net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
Date: Sat, 14 Mar 2026 17:50:04 +0000 [thread overview]
Message-ID: <177351060454.1744213.12265570325203026685.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <abHA3AjNtqa1nx9k@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Hello:
This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Wed, 11 Mar 2026 12:22:04 -0700 you wrote:
> A potential race condition exists in mana_hwc_destroy_channel() where
> hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and
> Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt
> handler to dereference freed memory, leading to a use-after-free or
> NULL pointer dereference in mana_hwc_handle_resp().
>
> mana_smc_teardown_hwc() signals the hardware to stop but does not
> synchronize against IRQ handlers already executing on other CPUs. The
> IRQ synchronization only happens in mana_hwc_destroy_cq() via
> mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs
> after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()
> can dereference freed caller_ctx (and rxq->msg_buf) in
> mana_hwc_handle_resp().
>
> [...]
Here is the summary with links:
- [net,v2] net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown
https://git.kernel.org/netdev/net/c/fa103fc8f569
You are awesome, thank you!
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prev parent reply other threads:[~2026-03-14 17:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-11 19:22 [PATCH net,v2] net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown Dipayaan Roy
2026-03-13 13:40 ` Simon Horman
2026-03-14 17:50 ` patchwork-bot+netdevbpf [this message]
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