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 F3B7C11731 for ; Thu, 24 Aug 2023 15:00:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 728AAC433C8; Thu, 24 Aug 2023 15:00:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692889208; bh=mKsM6gehpBxEHPY3+pPky0qtr9fwrmbySSGGTyapVCE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dw6viVJ4a+zH0wx/UnLDuMo9Jb0jr7mhpMix6pREaHYEHkZhdrPUZPv5281kJPEny jdTbpFVa6BlGXIlCa6MAcNz+21KcY241S7t4nwOTGGDMSZ1Bul7E2wl4RL4s9I8UsB khFKbrU6sU/4A4J14yoD5jQG7EFRX4q7wppnF+eg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Immad Mir , Dave Kleikamp , Sasha Levin Subject: [PATCH 5.10 026/135] FS: JFS: Check for read-only mounted filesystem in txBegin Date: Thu, 24 Aug 2023 16:49:29 +0200 Message-ID: <20230824145028.078064554@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230824145027.008282920@linuxfoundation.org> References: <20230824145027.008282920@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: Immad Mir [ Upstream commit 95e2b352c03b0a86c5717ba1d24ea20969abcacc ] This patch adds a check for read-only mounted filesystem in txBegin before starting a transaction potentially saving from NULL pointer deref. Signed-off-by: Immad Mir Signed-off-by: Dave Kleikamp Signed-off-by: Sasha Levin --- fs/jfs/jfs_txnmgr.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c index c8ce7f1bc5942..6f6a5b9203d3f 100644 --- a/fs/jfs/jfs_txnmgr.c +++ b/fs/jfs/jfs_txnmgr.c @@ -354,6 +354,11 @@ tid_t txBegin(struct super_block *sb, int flag) jfs_info("txBegin: flag = 0x%x", flag); log = JFS_SBI(sb)->log; + if (!log) { + jfs_error(sb, "read-only filesystem\n"); + return 0; + } + TXN_LOCK(); INCREMENT(TxStat.txBegin); -- 2.40.1