From: patchwork-bot+netdevbpf@kernel.org
To: lazyming <minhnguyen.080505@gmail.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
sowmini.varadhan@oracle.com, willemdebruijn.kernel@gmail.com,
w@1wt.eu, security@kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, asml.silence@gmail.com,
achender@kernel.org, mst@redhat.com, jasowang@redhat.com,
willemb@google.com
Subject: Re: [PATCH net v2] net: skbuff: fix missing zerocopy reference in pskb_carve helpers
Date: Thu, 28 May 2026 11:30:05 +0000 [thread overview]
Message-ID: <177996780540.882966.17298529776161153629.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260526041240.329462-1-minhnguyen.080505@gmail.com>
Hello:
This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:
On Tue, 26 May 2026 11:12:39 +0700 you wrote:
> From: Minh Nguyen <minhnguyen.080505@gmail.com>
>
> pskb_carve_inside_header() and pskb_carve_inside_nonlinear() both copy
> the old skb_shared_info header into a new buffer via memcpy(), which
> includes the destructor_arg pointer (uarg) for MSG_ZEROCOPY skbs.
> Neither function calls net_zcopy_get() for the new shinfo, creating an
> unaccounted holder: every skb_shared_info with destructor_arg set will
> call skb_zcopy_clear() once when freed, but the corresponding
> net_zcopy_get() was never called for the new copy. Repeated calls
> drive uarg->refcnt to zero prematurely, freeing ubuf_info_msgzc while
> TX skbs still hold live destructor_arg pointers.
>
> [...]
Here is the summary with links:
- [net,v2] net: skbuff: fix missing zerocopy reference in pskb_carve helpers
https://git.kernel.org/netdev/net/c/98d0912e9f84
You are awesome, thank you!
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next prev parent reply other threads:[~2026-05-28 11:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-26 4:12 [PATCH net v2] net: skbuff: fix missing zerocopy reference in pskb_carve helpers lazyming
2026-05-28 11:30 ` patchwork-bot+netdevbpf [this message]
2026-05-28 18:32 ` Pavel Begunkov
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