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=1794061848; b=AUo5IrFXQvqJaID3kt/Gxw84emyMkTI731a+sUV8XCuSctomu8SlnWxhe7IxdD1EsMSg W5wCHdi9GE7NMfV1gLAO06bwiaTjJwE2UNTzI2P/lYgqjhxouJGiQB8dQYcWIBGTpRV7n gcxyxK1AlZYXz8dye5oYXi6r7ZSypQuXowG240rZ0d9PdE+4rPsDbY16YFb/9km5WPOtA tEJVhbbWZfCCe5zC+sLcxhdHKU9vYHpy7GK/THe8ud93G99Wy420RrN3Wbh4hzMm6JyGr /L7TfEskK++9dY0665r/+84fCKLFfC8KCqE8IEO89Oth75UGken1UPhnzuKDaHCTsnQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061848; 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=IZWafHOcVlNS3IN5ZwviSYiOER8o4pp5bzWUpAQ2nWE=; b=rzUBwZUmc+zziKgcWuH7vdOOn/aRr0yAz7mTHMdAs8XYDSWuZmyHfRyUH9WhPlV+XBig avG3xrSsfsmvoIgh1qldkFmarAIHQGhrZFlnePKhA2vxKQc75kSnI6oDNGYPSZV7py83P DivVwyse55apFdoMHLk0JwRa+kbifHhsCG4L2DFt4JojDEAhHAbpc2Z/f9Gu3AwTDYdws 60ZfrtMPuFAEsqUBjwmSyPwS1sV9trChUzSOtEXZpMazS8TTy/+HU8ga7O4EYfKVkoveq /op00pJ0A8Rf+s8+lnMLzKwGkAsAjhRfOU0Tus+8Kv0gZW/OIgfevrM1FT1nzJBKfFw== 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=IARv336I; 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 DDC45606A32C; Sat, 7 Nov 2026 14:30:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=IARv336I Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B5A51F0089F; Sat, 7 Nov 2026 14:30:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061847; bh=IZWafHOcVlNS3IN5ZwviSYiOER8o4pp5bzWUpAQ2nWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IARv336IwEZVgVQQKT2V2qYcIHm0vTt6YSzsv52c+tshz6KpvN3B74qqqdY+9zYbu EOTuxd34ZMPDpvPc9/0B5fTk5VcaiX54qqOqCtMKFKh0V7CQWV5sDLBX/p7NvVeJSb niVa7n6RyayPAlSf1OUEFiYbk8Pltd3hNK0RDgmo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yichong Chen , Jens Axboe Subject: [PATCH 6.12 0829/1536] io_uring/net: keep recvmsg buffer select length within MAX_RW_COUNT Date: Sat, 7 Nov 2026 08:47:25 -0500 Message-ID: <20261107135020.830363405@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yichong Chen Commit 18d3f56eb6e6500a65d81cf265f0fe74fd9ecab6 upstream. io_recvmsg() takes the transfer length from the ring provided buffer when sqe->len is 0, and such a buffer can be up to 4G. min_ret is an int, so 2G or more makes it negative and the (ret < min_ret) block is skipped, and the oversized length reaches the socket layer unchanged: an empty socket then completes with 0 instead of arming poll, and a short read is reported as complete. Clamp the length to MAX_RW_COUNT, as io_recv() does. Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers") Signed-off-by: Yichong Chen Link: https://patch.msgid.link/20261023112209.87979-1-chenyichong@uniontech.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- io_uring/net.c | 1 + 1 file changed, 1 insertion(+) --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1061,6 +1061,7 @@ retry_multishot: sel = io_buffer_select(req, &len, issue_flags); if (!sel.addr) return -ENOBUFS; + len = min_t(size_t, len, MAX_RW_COUNT); if (req->flags & REQ_F_APOLL_MULTISHOT) { ret = io_recvmsg_prep_multishot(kmsg, sr, &sel.addr, &len);