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Subject[PATCH] FS: JFS: Check for read-only mounted filesystem in txBegin
Date
From: Immad Mir <mirimmad17@gmail.com>

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>
---
fs/jfs/jfs_txnmgr.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index ffd4feece..87dc4e3a4 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -353,7 +353,10 @@ 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);
--
2.40.0
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