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Wed, 04 Nov 2026 10:43:58 -0800 (PST) Received: from xps16 ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id 5614622812f47-567a9fdfa53sm2199007b6e.15.2026.11.04.10.43.58 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 10:43:58 -0800 (PST) From: Jens Axboe To: stable@vger.kernel.org Subject: [PATCH 6.12.y 2/9] io_uring/net: keep recvmsg buffer select length within MAX_RW_COUNT Date: Wed, 4 Nov 2026 11:43:46 -0700 Message-ID: <20261104184353.516403-3-axboe@kernel.dk> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104184353.516403-1-axboe@kernel.dk> References: <20261104184353.516403-1-axboe@kernel.dk> 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 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 --- io_uring/net.c | 1 + 1 file changed, 1 insertion(+) diff --git a/io_uring/net.c b/io_uring/net.c index b7f7c5fa0bf8..43edc6cf13f6 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -1061,6 +1061,7 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 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); -- 2.56.0