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Mon, 27 Jul 2026 09:24:54 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (bond0.slc5-n17m28-k8s.dev.purestorage.com [IPv6:2620:125:9025:20::a31:41f]) by c7-smtp-2026.dev.purestorage.com (Postfix) with ESMTP id 5FA364001C; Mon, 27 Jul 2026 10:24:53 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 5321FE40873; Mon, 27 Jul 2026 10:24:53 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe Cc: Caleb Sander Mateos , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] ublk: remove WARN_ON_ONCE() in ublk_unmap_io() Date: Mon, 27 Jul 2026 10:24:50 -0600 Message-ID: <20260727162450.2921500-1-csander@purestorage.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit io->res is set from struct ublksrv_io_cmd's result field, which is controlled by the ublk server process, without any validation. It's thus possible for userspace to trigger the io->res > rq_bytes warning. ublk_copy_user_pages() already limits the copy length to the request data length, so drop the warning. Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 4ca6ec738c93..4f30644756df 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -1492,12 +1492,10 @@ static unsigned int ublk_unmap_io(bool need_map, if (ublk_need_unmap_req(req)) { struct iov_iter iter; const int dir = ITER_SOURCE; - WARN_ON_ONCE(io->res > rq_bytes); - import_ubuf(dir, u64_to_user_ptr(io->buf.addr), io->res, &iter); return ublk_copy_user_pages(req, 0, &iter, dir); } return rq_bytes; } -- 2.54.0