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Thu, 08 Apr 2021 05:42:34 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-488-b93KfVuJPcqDWJ6k5P0LLQ-1; Thu, 08 Apr 2021 05:42:28 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ACF813F09; Thu, 8 Apr 2021 09:42:27 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (ovpn-13-61.pek2.redhat.com [10.72.13.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5226510013C1; Thu, 8 Apr 2021 09:42:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617874950; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type:in-reply-to:in-reply-to: references:references; bh=g9wLeVhAmi7YFvv8w5bNwWrNKJYxTRwIV8410P0iNJA=; b=A/w9H7VIQkbauik6rLth+sNR9s1dHOvBvxAyrNWnPUf+1dWRj5ZJ3BlDrnmS+nbZJXNoa0 q5H+riA/MHt7JTe/9XlPvB0aqzFA6XoTWHtdI3EhHu7IFcvlxHvD6/f6xpGaLVKF9ak4f1 HHp8oUOXqRZ+dQwpCTPuyg9DrCHz3Qs= X-MC-Unique: b93KfVuJPcqDWJ6k5P0LLQ-1 From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Subject: [PULL 6/6] tap-win32: correctly recycle buffers Date: Thu, 8 Apr 2021 17:42:11 +0800 Message-Id: <1617874931-4437-7-git-send-email-jasowang@redhat.com> In-Reply-To: <1617874931-4437-1-git-send-email-jasowang@redhat.com> References: <1617874931-4437-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=63.128.21.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Commit 969e50b61a28 ("net: Pad short frames to minimum size before sending from SLiRP/TAP") tries to pad frames but try to recyle the local array that is used for padding to tap thread. This patch fixes this by recyling the original buffer. Fixes: 969e50b61a28 ("net: Pad short frames to minimum size before sending = from SLiRP/TAP") Tested-by: Howard Spoelstra Tested-by: Bin Meng Reviewed-by: Bin Meng Signed-off-by: Jason Wang --- net/tap-win32.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/tap-win32.c b/net/tap-win32.c index fb92b55..897bd18 100644 --- a/net/tap-win32.c +++ b/net/tap-win32.c @@ -686,7 +686,7 @@ static ssize_t tap_receive(NetClientState *nc, const ui= nt8_t *buf, size_t size) static void tap_win32_send(void *opaque) { TAPState *s =3D opaque; - uint8_t *buf; + uint8_t *buf, *orig_buf; int max_size =3D 4096; int size; uint8_t min_pkt[ETH_ZLEN]; @@ -694,6 +694,8 @@ static void tap_win32_send(void *opaque) =20 size =3D tap_win32_read(s->handle, &buf, max_size); if (size > 0) { + orig_buf =3D buf; + if (!s->nc.peer->do_not_pad) { if (eth_pad_short_frame(min_pkt, &min_pktsz, buf, size)) { buf =3D min_pkt; @@ -702,7 +704,7 @@ static void tap_win32_send(void *opaque) } =20 qemu_send_packet(&s->nc, buf, size); - tap_win32_free_buffer(s->handle, buf); + tap_win32_free_buffer(s->handle, orig_buf); } } =20 --=20 2.7.4