From: Immad Mir <mirimmad17@gmail.com>
Date: Fri, 23 Jun 2023 13:47:08 +0000 (+0530)
Subject: FS: JFS: Check for read-only mounted filesystem in txBegin
X-Git-Tag: v6.5-rc1~150^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=95e2b352c03b0a86c5717ba1d24ea20969abcacc;p=thirdparty%2Flinux.git

FS: JFS: Check for read-only mounted filesystem in txBegin

 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 <mirimmad17@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
---

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index ffd4feece0785..ce4b4760fcb1d 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);