From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793207411; b=qdqmYmDOGdC8ZceHwdinWNJ0de8hMH/gVWH7TvZV64Upaoh1zb7D0qZJLYtSC8r2i/nj tD5O6n06ayni74xKyrFnxrZz9djFetMfmuLp2miRXM2p3s2+4eXMub8SVGV5JhK3YgTzI U4uyijYYLEB84j/XrBCcsRWqFDtrakTme61DOrBZzXpEQQ3INj67/QzZZKCgdCgSqF3FI atT+5B13xjlcUV+DCIXPtfeo09G5+V4CPosLK9wuBd2/3rJdrh190ji14qFnsfG4FQNPC MP5T1AHhiq1Y3B7Ux0+O8G2N/NolRGTkGLRcm88PDi9xV3yX69KE1h0YfcB5ytdAYdQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793207411; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=keaSVXUjlZR/XnDsb2IKm5sMQkdm3aykOzcPl07yk+I=; b=BZHYtjF8B6/jc9FRQjkTOdKb36epqte74fJuNqdm6tp0mYSZdOTgJU/TEERnurqURnKv 1oNFSTfLMp1VDeNdywa7dlufzZ1TY3Fls6q9GsHiqU/jEblflvDyC1b4bnRsM49wihQmq 4xvmml33qqI70OM7CYZzDF2cBvylNALLcK4tuEmZWHbGtLlcoaGn1+ZGxln9yfb31dvM2 GH1bgOveq7adVuC2go6yGnnIX1FICUAZG8Fjrkj36B06n9bO7rY3nuCZ2TVIcYaLVIl9b tvMf8EBiPi8KC6AJGmrDgCHpYOO30HbciNhTz0DYkpuYNUq5tY9weUVU6Q0whPauM8w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=OZCtPqbo; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B1FD606A31C; Wed, 28 Oct 2026 17:10:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=OZCtPqbo Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C0C11F01825; Wed, 28 Oct 2026 17:10:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793207411; bh=keaSVXUjlZR/XnDsb2IKm5sMQkdm3aykOzcPl07yk+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OZCtPqbor5sgCdynGBcjopPzQH4CZR+8c2WL+77LsHzn6G8rsCecxhtLMi4C1S+Rq OmMB4SV/i7OA6DOOSZiP9PgAex5/D8HTGYDhz0PJDe+DjPVN0HkJG6+hL3bTKcqSTP aHPv+U3+PBO0TYB2BcTgGq9IO4y++yZdgzFtTHrI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tamaki Yanagawa , Jens Axboe Subject: [PATCH 7.2 65/88] io_uring/net: keep recv buffer select length within MAX_RW_COUNT Date: Wed, 28 Oct 2026 18:00:13 +0100 Message-ID: <20261028165943.646116319@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028165942.107695352@linuxfoundation.org> References: <20261028165942.107695352@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tamaki Yanagawa Commit 96262cfab554cf11412de7a6247f0e82c94e130f upstream. Since commit dcbd1c054848 ("io_uring/net: let io_recv_buf_select return the length of the buffer region"), io_recv_buf_select() returns the selected length as an int. For a non-bundle recv with sqe->len == 0 the length comes from the ring provided buffer, which can be up to 4G, so a buffer of 2G or more makes io_recv() fail the request with a bogus negative result (e.g. -2147483648) instead of receiving into it. Clamp the length to MAX_RW_COUNT, which import_ubuf() limits the transfer to anyway. Fixes: dcbd1c054848 ("io_uring/net: let io_recv_buf_select return the length of the buffer region") Cc: stable@vger.kernel.org Signed-off-by: Tamaki Yanagawa Assisted-by: Claude:claude-opus-5-5 Link: https://patch.msgid.link/20261018042227.1105-1-ty@000ty.net Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- io_uring/net.c | 2 ++ 1 file changed, 2 insertions(+) --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1228,6 +1228,8 @@ static int io_recv_buf_select(struct io_ *sel = io_buffer_select(req, &len, sr->buf_group, issue_flags); if (!sel->addr) return -ENOBUFS; + /* ring provided buffers can be up to 4G, keep len an int */ + len = min_t(size_t, len, MAX_RW_COUNT); sr->buf = sel->addr; sr->len = len; map_ubuf: