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Message-Id: <20230724011338.2298062-58-sashal@kernel.org>
Date: Sun, 23 Jul 2023 21:13:26 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Immad Mir <mirimmad17@...il.com>,
Dave Kleikamp <dave.kleikamp@...cle.com>,
Sasha Levin <sashal@...nel.org>, shaggy@...nel.org,
jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 6.4 58/58] FS: JFS: Check for read-only mounted filesystem in txBegin
From: Immad Mir <mirimmad17@...il.com>
[ 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 <mirimmad17@...il.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
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 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);
--
2.39.2
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