From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D75D11C6891; Tue, 27 Aug 2024 14:52:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724770379; cv=none; b=L1qf/7ogrTTS1YLMWWJ3DbrSRhlHPD52gs17a5T2jiqKZeiYlGp8rjmg9GwIO5PNZz+0V7DAVGyc9q6eloA8mdAbyJAwxfJhVH3nFaMPzWPqyaZHaUeN7BRlUxazQ/af6qFbiXAMe0tCkAHcvYpP9y3L/Htiykon7aXj5lOmJCY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724770379; c=relaxed/simple; bh=fVmHMFrXpARnYJmG0PPY9N5UvxHct60YcI1OkkJ55do=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ssi9E2wxhOpNwR9OzzKXq/o9Mnv6MD/iPJm986v3D0fE6NJA9nx14kapvCzLUQfBuGEPHmDgRh2aErPyZ/nWzNuJ2HLSqkpkB9tYaVClqoTBr2cVx5EZLjcqoDi8pZzgBXvoCqGbOvosk9E9TammOKDd7GfhNHRVFeYRKOCIEuM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Z/d/jYea; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Z/d/jYea" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F19CFC61042; Tue, 27 Aug 2024 14:52:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1724770379; bh=fVmHMFrXpARnYJmG0PPY9N5UvxHct60YcI1OkkJ55do=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z/d/jYeabAGc4eoNZ57uale6l+CuXWS5MmjSLlrG+E/Lc8VU46too1bc7Y6Eu31ck UZp4QkZWyJdapagAcXMR/2dWLsT34ut1vLQdjhmVv5N26Titg/cB8vV4h1QsS8h4il fi8U/wIsCzi8xl8vFAzW0Tr0qleH2qSIFIlkVevc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sagi Grimberg , Christoph Hellwig , Keith Busch , Sasha Levin Subject: [PATCH 6.6 211/341] nvmet-rdma: fix possible bad dereference when freeing rsps Date: Tue, 27 Aug 2024 16:37:22 +0200 Message-ID: <20240827143851.440991942@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240827143843.399359062@linuxfoundation.org> References: <20240827143843.399359062@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sagi Grimberg [ Upstream commit 73964c1d07c054376f1b32a62548571795159148 ] It is possible that the host connected and saw a cm established event and started sending nvme capsules on the qp, however the ctrl did not yet see an established event. This is why the rsp_wait_list exists (for async handling of these cmds, we move them to a pending list). Furthermore, it is possible that the ctrl cm times out, resulting in a connect-error cm event. in this case we hit a bad deref [1] because in nvmet_rdma_free_rsps we assume that all the responses are in the free list. We are freeing the cmds array anyways, so don't even bother to remove the rsp from the free_list. It is also guaranteed that we are not racing anything when we are releasing the queue so no other context accessing this array should be running. [1]: -- Workqueue: nvmet-free-wq nvmet_rdma_free_queue_work [nvmet_rdma] [...] pc : nvmet_rdma_free_rsps+0x78/0xb8 [nvmet_rdma] lr : nvmet_rdma_free_queue_work+0x88/0x120 [nvmet_rdma] Call trace: nvmet_rdma_free_rsps+0x78/0xb8 [nvmet_rdma] nvmet_rdma_free_queue_work+0x88/0x120 [nvmet_rdma] process_one_work+0x1ec/0x4a0 worker_thread+0x48/0x490 kthread+0x158/0x160 ret_from_fork+0x10/0x18 -- Signed-off-by: Sagi Grimberg Reviewed-by: Christoph Hellwig Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- drivers/nvme/target/rdma.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 4597bca43a6d8..a6d55ebb82382 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -473,12 +473,8 @@ nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue) return 0; out_free: - while (--i >= 0) { - struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; - - list_del(&rsp->free_list); - nvmet_rdma_free_rsp(ndev, rsp); - } + while (--i >= 0) + nvmet_rdma_free_rsp(ndev, &queue->rsps[i]); kfree(queue->rsps); out: return ret; @@ -489,12 +485,8 @@ static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue) struct nvmet_rdma_device *ndev = queue->dev; int i, nr_rsps = queue->recv_queue_size * 2; - for (i = 0; i < nr_rsps; i++) { - struct nvmet_rdma_rsp *rsp = &queue->rsps[i]; - - list_del(&rsp->free_list); - nvmet_rdma_free_rsp(ndev, rsp); - } + for (i = 0; i < nr_rsps; i++) + nvmet_rdma_free_rsp(ndev, &queue->rsps[i]); kfree(queue->rsps); } -- 2.43.0