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=1793831882; b=G6eoighXuwadKuu1YaAQLDvilGsgrMrINgl7i2IizNNVufbcZhx54TYIbj0bJ8AXLakY K/GpJLyMiRObQvprVZVXpCb7Uvv5iosUvNN9UauZZ1ZxZlCvZFiRXpc++IdtUMhPoxiwu TmaBxwfDF0p4NOvIwmaXbf6TikbjS0Uqx1dKbr7qM63VRLQ68vTuNPH98UfcNSnXgQlw7 w9oxpgzSi71NaoMbIY+oeZkRhJGRjSmpPa3jMTRevWukvkidCuTNvuBe+8cRD0FDJ694A jOlgQkPa9LcnIVd78UeecoZDD/vs0rjxI0LJwinyAPjxw16MbJxb3Tux6ykTg21eMGA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793831882; 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=dQeUDfiTMk6Jt/v5Is5NQKobejpNYw3cUgfLhbK1UFc=; b=sbCGsPmOCwBGX6D8uMHLXPFZyll+MZhkxP7FwtjVePv49Vx8GSLqDOS3ARmg4OlZTADJ NdOng+4Zl0ambBtSh/TUsMTiGTuVs0m+m6V0dZRRvf8rlHHf93eUaP9fH2CvT25nxvNVa jDir1fTaggiZQE/ycK3rb3D1aoQRcAyChEt3yRzvKQnWgEsjvfkDqbjzLYXWzGYu4VjAY NQ0gwoD/1Ed87/C/f1XFXF2Lh+aeOX9v4XMvoyARrrv1vGK3DdaY3f2o4JTiWZtbQ1BeY ZsO13jSUKp0B2ugp+TErJSoISBUBXwPCK0DV7rD0xaYJikgbMCke9xw/c7Vo7lBPO8A== 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=m4nyrSDE; 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 3F25B606A33F; Wed, 4 Nov 2026 22:38:01 +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=m4nyrSDE Received: by smtp.kernel.org (Postfix) with ESMTPSA id 892521F000C1; Wed, 4 Nov 2026 22:38:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793831881; bh=dQeUDfiTMk6Jt/v5Is5NQKobejpNYw3cUgfLhbK1UFc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=m4nyrSDE5bbiGzYT2WgHA/T7LMnQ/3SMyyeUO1vqWpG9FE17djpZtYw2HUc5BXK5R ilw81cMObJnJwDqlKcNDYNPy0bxEeXx1XCrMdOSONcxFp7hQhl2O8IwpM9nm8uDAuz bs8wgzuUzPKqk4P7DpTpWLY/kJFyK7dnHIhnRua0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yichong Chen , Jens Axboe Subject: [PATCH 6.18 0972/1005] io_uring/net: keep recvmsg buffer select length within MAX_RW_COUNT Date: Wed, 4 Nov 2026 16:11:45 -0500 Message-ID: <20261104211110.290898076@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@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 6.18-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 @@ -1066,6 +1066,7 @@ retry_multishot: sel = io_buffer_select(req, &len, sr->buf_group, 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);