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 2CD236FA1 for ; Wed, 30 Nov 2022 18:29:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4B45C433D6; Wed, 30 Nov 2022 18:29:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669832992; bh=znRJbUmv+wwknGW70xiegCD89z+SP01c/rJ5PIHJQzw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bg+W8eef4YGo9W5jbnASYuXQ0tj3fuBQPwENWiPLPkrPTcqHDH7JIUrXx/d/8rHoF +19IG+SJNBlTtaV2tYnTVA5weYRqXYNgWJz1bKUsYxo+wydQ3aeBZS+WB9AHRgG8QD gQnCTJ5cjEnApEGLf9yrlBtbs3SfShMdURZpivjM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiubo Li , Jeff Layton , Aaron Tomlin , Ilya Dryomov , Sasha Levin Subject: [PATCH 5.10 113/162] ceph: fix possible NULL pointer dereference for req->r_session Date: Wed, 30 Nov 2022 19:23:14 +0100 Message-Id: <20221130180531.552731658@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221130180528.466039523@linuxfoundation.org> References: <20221130180528.466039523@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 [ Upstream commit 7acae6183cf37c48b8da48bbbdb78820fb3913f3 ] The request will be inserted into the ci->i_unsafe_dirops before assigning the req->r_session, so it's possible that we will hit NULL pointer dereference bug here. Cc: stable@vger.kernel.org URL: https://tracker.ceph.com/issues/55327 Signed-off-by: Xiubo Li Reviewed-by: Jeff Layton Tested-by: Aaron Tomlin Signed-off-by: Ilya Dryomov Stable-dep-of: 5bd76b8de5b7 ("ceph: fix NULL pointer dereference for req->r_session") Signed-off-by: Sasha Levin --- fs/ceph/caps.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 4e2fada35808..ce6a858e765a 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -2346,6 +2346,8 @@ static int unsafe_request_wait(struct inode *inode) list_for_each_entry(req, &ci->i_unsafe_dirops, r_unsafe_dir_item) { s = req->r_session; + if (!s) + continue; if (unlikely(s->s_mds >= max_sessions)) { spin_unlock(&ci->i_unsafe_lock); for (i = 0; i < max_sessions; i++) { @@ -2366,6 +2368,8 @@ static int unsafe_request_wait(struct inode *inode) list_for_each_entry(req, &ci->i_unsafe_iops, r_unsafe_target_item) { s = req->r_session; + if (!s) + continue; if (unlikely(s->s_mds >= max_sessions)) { spin_unlock(&ci->i_unsafe_lock); for (i = 0; i < max_sessions; i++) { -- 2.35.1