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Subject[PATCH AUTOSEL 5.15 23/23] FS: JFS: Check for read-only mounted filesystem in txBegin
Date
From: Immad Mir <mirimmad17@gmail.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@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 042bbe6d8ac2e..6c8680d3907af 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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