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 92492171A9 for ; Mon, 22 May 2023 19:21:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A1F3C4339B; Mon, 22 May 2023 19:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684783273; bh=mvaH/ft45hKSwlqj6qSsLzH/xsI4osguc62vsp3jqwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vRatyjSjNkh0dylQgl6fHhrMdGz/e62XhnNL49TxiXkVMli0crcAAM+M6E49aiYvQ VWfLRUF8syVzXCGPnDAn18zvf/tM74nyKYbKRJZ/VWqaBzOqsHuhTraZmpRImCG2Fz lL9jldrB+lkL/k/oa7S3fTfwQjAPrNfnFlteyktw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Frank Schilder , Xiubo Li , Ilya Dryomov Subject: [PATCH 5.15 195/203] ceph: force updating the msg pointer in non-split case Date: Mon, 22 May 2023 20:10:19 +0100 Message-Id: <20230522190400.428217882@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190354.935300867@linuxfoundation.org> References: <20230522190354.935300867@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xiubo Li commit 4cafd0400bcb6187c0d4ab4d4b0229a89ac4f8c2 upstream. When the MClientSnap reqeust's op is not CEPH_SNAP_OP_SPLIT the request may still contain a list of 'split_realms', and we need to skip it anyway. Or it will be parsed as a corrupt snaptrace. Cc: stable@vger.kernel.org Link: https://tracker.ceph.com/issues/61200 Reported-by: Frank Schilder Signed-off-by: Xiubo Li Reviewed-by: Ilya Dryomov Signed-off-by: Ilya Dryomov Signed-off-by: Greg Kroah-Hartman --- fs/ceph/snap.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -1028,6 +1028,19 @@ skip_inode: continue; adjust_snap_realm_parent(mdsc, child, realm->ino); } + } else { + /* + * In the non-split case both 'num_split_inos' and + * 'num_split_realms' should be 0, making this a no-op. + * However the MDS happens to populate 'split_realms' list + * in one of the UPDATE op cases by mistake. + * + * Skip both lists just in case to ensure that 'p' is + * positioned at the start of realm info, as expected by + * ceph_update_snap_trace(). + */ + p += sizeof(u64) * num_split_inos; + p += sizeof(u64) * num_split_realms; } /*