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 A65B13D88F6; Tue, 16 Jun 2026 18:21:50 +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=1781634111; cv=none; b=p+H0pfqKDflvOrBUmoMtJhxEnvIzkHUw6e2NATIvxcIvLttOS9m8ddSWlKfvKH51EFcHDTEde/Dhrojb7nh3jWpVit9o8MNj/5+8pK3KVk/DSbyeWAHOBqucfYiR+K3dl4rpFP/h7CcokxfAYOvO43vS3FovdOOIAg0L9fztl58= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781634111; c=relaxed/simple; bh=QAJ5ePTvboD5jEkPCYxJYNSGYM9jkNDXEkrZ/BMemAI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=l2epTPx7aMdaZXJnDNh+iZZDRcBuL40hxzLT/KSGbdbn/zVqh3MxTmQfXXN5R3cH0Ga+ksSGbQ4UAKGFCTZgoTnHtoUkVaokQXsMkkiRevKZV1Vvm1c61X3xD+wXPLhzmqsvyEVhyrE95mDxxoDVlgvuNJ7fpTadd000N5/OwXQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UGkGUG6p; 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="UGkGUG6p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ADBC21F000E9; Tue, 16 Jun 2026 18:21:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781634110; bh=dQt+TTqYYDsH/umHMiXoK1qARzG3SVNKemIkv0XsB90=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UGkGUG6pr7kru/zWO+SN7Q/x9YjmLg66ARMi+JUSa/Ud6r4O3nLsp67nCJpBHYUwt aYw1LalWEhgf0vRzvVP8DYrNemiqK6vqReJe97lN541l0qn5dynPqJME+Jr6TJY2ss 96zEdYxw2u0mkVlMdSdkX9LZt2UJYb39jI0cr254= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Yuan Tan , Yifan Wu , Juefei Pu , Zhengchuan Liang , Xin Liu , Wyatt Feng , Ren Wei , Steffen Klassert Subject: [PATCH 5.15 204/411] xfrm: espintcp: do not reuse an in-progress partial send Date: Tue, 16 Jun 2026 20:27:22 +0530 Message-ID: <20260616145111.583067876@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145100.376842714@linuxfoundation.org> References: <20260616145100.376842714@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wyatt Feng commit c381039ade2e161ab08c0eda73c4f8b9a7115928 upstream. espintcp keeps a single in-flight transmit in ctx->partial. Before building a new sk_msg, espintcp_sendmsg() first tries to flush that state through espintcp_push_msgs(). For blocking callers, espintcp_push_msgs() may return success even when the previous partial send is still pending. espintcp_sendmsg() would then reinitialize emsg->skmsg and reuse ctx->partial while the old transfer still owns that state. Do not rebuild the send message when ctx->partial is still in progress. If espintcp_push_msgs() returns with emsg->len still set, fail the new send instead of overwriting the live partial state. This is a memory-safety fix: reusing the live partial-send state can leave a stale offset attached to a new sk_msg and lead to an out-of- bounds read in the send path. tcp_sendmsg_locked() already handles waiting for send buffer memory, so the fix here is just to preserve espintcp's one-message-at-a-time transmit state. Fixes: e27cca96cd68 ("xfrm: add espintcp (RFC 8229)") Cc: stable@kernel.org Reported-by: Yuan Tan Reported-by: Yifan Wu Reported-by: Juefei Pu Reported-by: Zhengchuan Liang Reported-by: Xin Liu Assisted-by: Codex:GPT-5.4 Signed-off-by: Wyatt Feng Signed-off-by: Ren Wei Signed-off-by: Steffen Klassert Signed-off-by: Greg Kroah-Hartman --- net/xfrm/espintcp.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/net/xfrm/espintcp.c +++ b/net/xfrm/espintcp.c @@ -342,6 +342,10 @@ static int espintcp_sendmsg(struct sock err = -ENOBUFS; goto unlock; } + if (emsg->len) { + err = -ENOBUFS; + goto unlock; + } sk_msg_init(&emsg->skmsg); while (1) {