From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 45FC633AD9B; Tue, 16 Jun 2026 16:39:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627967; cv=none; b=YzYt6ypnCYL4HzcuL0OLjC9/yloIc1DnSsaMByqLYI72s6aj4CVdkgzUX7BhgKyL8UMDx4FBYUR3cMtIemYd8gpO6RpuPBk2svfFOfeuEmLKqLj1ePlvTcFQ8Ul9JFJ+cDJxrvoaDyM/Eiu77Z0AOb/Ut81DaL+5+DNSWUAR1qU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627967; c=relaxed/simple; bh=xUtmZF7s2HrUPfprF60I2x8Ca8jpO816C+HyVw4Tta8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=j2+oiC4arTZy33e0TSNty0hUeDdqs+7ZJjSFaB0/ate+D4334lf0RzbBnFy7fI8pABAsYrKCZVuyEde//eKEZLSAfxBtx3UilxrAk/GP7TPwbQt6trCLzWzLsbrU1ySmXUcA8j/d2vABWCv/PFGTshZ7OV6bS2ZZ+3lhXf3tmSc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OOXZ214i; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="OOXZ214i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DCA531F000E9; Tue, 16 Jun 2026 16:39:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781627965; bh=LgPhSgUACxuHbjamRtRNdWKNpdG3FkIAT8TufhJW6Ww=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OOXZ214iDCTWRPmGuwV8FH4D8rn/d11LIMhw9852g01YBkoPlTwyDp01q+rUJ825K npka782DPIMoSzn8KicvdbntWSwJjcn69i66t6gSiKAzzty0Z4iuaQd4DWP0SwK4Tx Pdwaq6RjanWWDzuA8bdYo+j+YTRCJf/vMv9ekP1c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Arseniy Krasnov , Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , virtualization@lists.linux.dev, Jakub Kicinski Subject: [PATCH 6.12 248/261] vsock/virtio: fix potential unbounded skb queue Date: Tue, 16 Jun 2026 20:31:26 +0530 Message-ID: <20260616145056.572319514@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145044.869532709@linuxfoundation.org> References: <20260616145044.869532709@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet commit 059b7dbd20a6f0c539a45ddff1573cb8946685b5 upstream. virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc. virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM. If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0. Fix this by estimating the skb metadata size: (Number of skbs in the queue) * SKB_TRUESIZE(0) Fixes: 077706165717 ("virtio/vsock: don't use skbuff state to account credit") Signed-off-by: Eric Dumazet Cc: Arseniy Krasnov Cc: Stefan Hajnoczi Cc: Stefano Garzarella Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: Xuan Zhuo Cc: "Eugenio Pérez" Cc: virtualization@lists.linux.dev Link: https://patch.msgid.link/20260430122653.554058-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/vmw_vsock/virtio_transport_common.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -430,7 +430,9 @@ static int virtio_transport_send_pkt_inf static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, u32 len) { - if (vvs->buf_used + len > vvs->buf_alloc) + u64 skb_overhead = (skb_queue_len(&vvs->rx_queue) + 1) * SKB_TRUESIZE(0); + + if (skb_overhead + vvs->buf_used + len > vvs->buf_alloc) return false; vvs->rx_bytes += len;