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=1794273787; b=e/0bdjIl7IC1ZxdqGZ5NHElFez6CSVki5QNpZDkY3bjw000mhs5eJZl0BI226NYdquQx hXxGN1GdrKbwYsUKkohW0kM1M4Qi7R5BQX1u5VhYARcovatVNKBWpk5Yg71E5EYn53Vdw 6uHVwZ3c1E/j5g0VNGe5Uwf34+ZUFry1EPEZIobbnVWrIW/+PjNMuBZTPJ4VVCMc3dXFL 1/ubsaMmpdmbOxrHor/DcYzKv7Elcyy0AZhs5eSkrfwqqkEhQp45GzYAt5mwiRNhcDsSn J5aeEGNEiy6dTPfDqqfzfuundiqtsrhyRquvAC7G5Mol38nUNBcv2DuhY4LvUad76RA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794273787; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=zbVOg/XLUXpV+xMqSCHdG7lHtgjdiz6TtpEbtVu8C24=; b=feSMZPYZztBSOjh6CKjgvZjDqjJi2DOH90tpBUMIVMTkduJsTLypN0gL60BMMA67QVOQ AJX0qOyiQjO1HOQR4VKnFYtaFw4cg8dTuFlMlvD4R0nQ9xOOwDDulKm3IiOeXBEOFZkOY /4tzug39ACCwdckJSxDoAUQAyzT7qe8VBsXLeoUANBdDNvhBnQU5K+QNvGBpogGNhUuHh N5o9g8MPI3FZsqaM2VtW6JERW470ofgys7ZgH3j/xF+0sosGzE3yXgMSkjjjKUNzRkGeT opNpYwbRYblmCV1ATDesSOTaocB+0dcAVKez3VKneFCq2E1i9gQXxqbTy9d5B8PWwVA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=IfJ0hKQr; 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 8FFC2607184A for ; Tue, 10 Nov 2026 01:23:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=IfJ0hKQr Received: by smtp.kernel.org (Postfix) with ESMTPSA id E06E61F008A5; Tue, 10 Nov 2026 01:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794273787; bh=zbVOg/XLUXpV+xMqSCHdG7lHtgjdiz6TtpEbtVu8C24=; h=From:To:Cc:Subject:Date; b=IfJ0hKQrK01npASscMv/y3LlQmTS+cDxZ752HN2TcZh4zkQpZQV/8YfGI7LAPzOeH j+dmRyUZjM3pog1QjozHKUxEqXF8kiXKRV58nbCLoP1KyhG5PNFI/BCj5yoF1BKKJq 2k83sC3gq74H8e7gWTsssAORiJY1WTl8D1+tHysx3xfYTQR/PlulwY+5e12+0tHWr6 0+E7QdOmcyltEfQK7jw4jIv6LqUdMad9p0qxcFehTU/KAeuLyUGyqdt1Ujr9kl2Jj4 WFaBu23GIpix+5CSH6aR3hcTenyXZ536TIbKHVawSgOFBlyA6EdiXXiwwBGDE3b7WS 2M9RpcvXfEh0w== From: Sasha Levin To: 1075151112@qq.com, hch@lst.de, kbusch@kernel.org Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] nvmet: reject keep-alive timeouts that would overflow" failed to apply to 5.15-stable tree Date: Mon, 9 Nov 2026 20:23:05 -0500 Message-ID: <20261109202305-failed-5.15-96ae13f40ce5@kernel.org> X-Mailer: git-send-email 2.53.0 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 96ae13f40ce5930cd58c43128e385131476f2a66 # git commit -s git send-email --to '' --in-reply-to '20261109202305-failed-5.15-96ae13f40ce5@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 96ae13f40ce5930cd58c43128e385131476f2a66 Mon Sep 17 00:00:00 2001 From: Yingjie Wang <1075151112@qq.com> Date: Fri, 30 Oct 2026 16:46:22 +0800 Subject: [PATCH] nvmet: reject keep-alive timeouts that would overflow nvmet_set_feat_kato() and nvmet_alloc_ctrl() convert the 32-bit millisecond KATO from the host to seconds with DIV_ROUND_UP(kato, 1000). The addition in DIV_ROUND_UP() is done in 32 bits, so any KATO above 4294966296 ms wraps around and rounds to 0 seconds. A Set Features command with KATO 0xffffffff then succeeds but disables the keep-alive timer: Get Features returns 0 and Keep Alive fails with Keep Alive Timeout Invalid. A Connect command with such a KATO creates a controller without a keep-alive timer. The converted value has more consumers that can overflow. Get Features multiplies it by 1000, and the timer paths multiply it by HZ in 32 bits and arm a delay that must not exceed MAX_JIFFY_OFFSET. Reject a KATO whose rounded value does not fit all of these. Return Keep Alive Timeout Invalid from both Set Features and Connect. Validate Set Features before stopping the current timer so a failed update leaves its timeout unchanged. Round in 64 bits. A KATO of 0 keeps its current meaning. Fixes: a07b4970f464 ("nvmet: add a generic NVMe target") Cc: stable@vger.kernel.org Reviewed-by: Christoph Hellwig Signed-off-by: Yingjie Wang <1075151112@qq.com> Signed-off-by: Keith Busch --- drivers/nvme/target/admin-cmd.c | 7 ++++++- drivers/nvme/target/core.c | 8 +++++++- drivers/nvme/target/nvmet.h | 8 ++++++++ 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 26028be8fe4d8..a06cff8304db0 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -1227,8 +1227,13 @@ u16 nvmet_set_feat_kato(struct nvmet_req *req) { u32 val32 = le32_to_cpu(req->cmd->common.cdw11); + if (val32 > NVMET_MAX_KATO * MSEC_PER_SEC) { + req->error_loc = offsetof(struct nvme_common_command, cdw11); + return NVME_SC_KA_TIMEOUT_INVALID | NVME_STATUS_DNR; + } + nvmet_stop_keep_alive_timer(req->sq->ctrl); - req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000); + req->sq->ctrl->kato = DIV_ROUND_UP_ULL(val32, MSEC_PER_SEC); nvmet_start_keep_alive_timer(req->sq->ctrl); nvmet_set_result(req, req->sq->ctrl->kato); diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index a8171b88035c5..1dede04c204a6 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -1620,6 +1620,12 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args) u8 dhchap_status; int ret; + if (kato > NVMET_MAX_KATO * MSEC_PER_SEC) { + args->status = NVME_SC_KA_TIMEOUT_INVALID | NVME_STATUS_DNR; + args->error_loc = offsetof(struct nvmf_connect_command, kato); + return NULL; + } + args->status = NVME_SC_CONNECT_INVALID_PARAM | NVME_STATUS_DNR; subsys = nvmet_find_get_subsys(args->port, args->subsysnqn); if (!subsys) { @@ -1694,7 +1700,7 @@ struct nvmet_ctrl *nvmet_alloc_ctrl(struct nvmet_alloc_ctrl_args *args) kato = NVMET_DISC_KATO_MS; /* keep-alive timeout in seconds */ - ctrl->kato = DIV_ROUND_UP(kato, 1000); + ctrl->kato = DIV_ROUND_UP_ULL(kato, MSEC_PER_SEC); ctrl->err_counter = 0; spin_lock_init(&ctrl->error_lock); diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index d7804bf91aaa8..3cd58e813aa7f 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -7,6 +7,7 @@ #define _NVMET_H #include +#include #include #include #include @@ -714,6 +715,13 @@ void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, #define NVMET_KAS 10 #define NVMET_DISC_KATO_MS 120000 +/* + * Largest keep-alive timeout in seconds that can be reported back in + * milliseconds and converted to jiffies without overflowing. + */ +#define NVMET_MAX_KATO \ + min3(U32_MAX / MSEC_PER_SEC, U32_MAX / HZ, MAX_JIFFY_OFFSET / HZ) + int __init nvmet_init_configfs(void); void __exit nvmet_exit_configfs(void); -- 2.53.0