From patchwork Fri Mar 22 11:46:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Antoine Tenart X-Patchwork-Id: 13599997 X-Patchwork-Delegate: kuba@kernel.org 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 03F3D3F9D5 for ; Fri, 22 Mar 2024 11:46:33 +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=1711107994; cv=none; b=AZ8L/dbDBEfhs+yFT3Ub7XyvMx+PUcaSDMzyaRNfYLt70SqQgLGxUlPTwsfgYAot+uJYuCbD69XQsyLX6slyw3i7nWZnKAjpgyMvVfQkhc2AFx8FuGQqWJ2u3GJW+AqnD4uA0XI7Bmqo5CI7TO5UwM1uy6+YcnYTwTBruPg1f6w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711107994; c=relaxed/simple; bh=9AGZg+Pbqwe5RkEz1eQH+VUG1GXVEpPCjOgQ8W1uVY4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bViErqxZwWSX+p889XKkdexLj52DNXZY+CAb+WTP9MmhKPTDIv37S4L9da5WV83qMwGQOJF4IJMBeafrQbIrSgzb7NbSZjKqfjtAEN8O9VCSKh32wkIO0MMDtmjNNa8jtwa3LLY2Y9aUlCw43TdEiIlh0W4CNqB8wDO/c08lsPE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qP9Wq7e7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qP9Wq7e7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 267C6C433F1; Fri, 22 Mar 2024 11:46:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711107993; bh=9AGZg+Pbqwe5RkEz1eQH+VUG1GXVEpPCjOgQ8W1uVY4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qP9Wq7e7GlrDVg9hWQ8pcJITvd/9rTkDXgozhRv9fLRHr0gheIRAD6omJ2C6TulQa L7vx/8N79cAKrFXKDbTi7sMBSIQchaBOjYJzBM1ds6DodEqBtXB6UoLgcTZo2IRpjJ MpfuQz40qBfUwn/+HSK48b804EpDQ0CmVZde/+UFmQBq3m87TVxCKzfGYeSNOSnlio a4s4LXg6ikb+080mrELxTWqMpTSNCse50Y6XD6aF10u9nqgs1aENbeTwzAfZp0ftbS oDZjAA8ltjlvo/lBEoaMTWdxOUb1JJm3WLJwXzrUPJY08BqT3EuixKFPcs+PDQhTKI 0kTBGM128Q6LQ== From: Antoine Tenart To: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com Cc: Antoine Tenart , steffen.klassert@secunet.com, willemdebruijn.kernel@gmail.com, netdev@vger.kernel.org, Willem de Bruijn Subject: [PATCH net v3 2/4] gro: fix ownership transfer Date: Fri, 22 Mar 2024 12:46:21 +0100 Message-ID: <20240322114624.160306-3-atenart@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240322114624.160306-1-atenart@kernel.org> References: <20240322114624.160306-1-atenart@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org If packets are GROed with fraglist they might be segmented later on and continue their journey in the stack. In skb_segment_list those skbs can be reused as-is. This is an issue as their destructor was removed in skb_gro_receive_list but not the reference to their socket, and then they can't be orphaned. Fix this by also removing the reference to the socket. For example this could be observed, kernel BUG at include/linux/skbuff.h:3131! (skb_orphan) RIP: 0010:ip6_rcv_core+0x11bc/0x19a0 Call Trace: ipv6_list_rcv+0x250/0x3f0 __netif_receive_skb_list_core+0x49d/0x8f0 netif_receive_skb_list_internal+0x634/0xd40 napi_complete_done+0x1d2/0x7d0 gro_cell_poll+0x118/0x1f0 A similar construction is found in skb_gro_receive, apply the same change there. Fixes: 5e10da5385d2 ("skbuff: allow 'slow_gro' for skb carring sock reference") Signed-off-by: Antoine Tenart Reviewed-by: Willem de Bruijn --- net/core/gro.c | 3 ++- net/ipv4/udp_offload.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/net/core/gro.c b/net/core/gro.c index ee30d4f0c038..83f35d99a682 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -192,8 +192,9 @@ int skb_gro_receive(struct sk_buff *p, struct sk_buff *skb) } merge: - /* sk owenrship - if any - completely transferred to the aggregated packet */ + /* sk ownership - if any - completely transferred to the aggregated packet */ skb->destructor = NULL; + skb->sk = NULL; delta_truesize = skb->truesize; if (offset > headlen) { unsigned int eat = offset - headlen; diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index e9719afe91cf..3bb69464930b 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -449,8 +449,9 @@ static int skb_gro_receive_list(struct sk_buff *p, struct sk_buff *skb) NAPI_GRO_CB(p)->count++; p->data_len += skb->len; - /* sk owenrship - if any - completely transferred to the aggregated packet */ + /* sk ownership - if any - completely transferred to the aggregated packet */ skb->destructor = NULL; + skb->sk = NULL; p->truesize += skb->truesize; p->len += skb->len;