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authorImmad Mir <mirimmad17@gmail.com>2023-06-23 19:17:08 +0530
committerDave Kleikamp <dave.kleikamp@oracle.com>2023-06-23 09:02:33 -0500
commit95e2b352c03b0a86c5717ba1d24ea20969abcacc (patch)
tree053e77eaf31df4d06678888bc066f7d0ae848748
parent47cfdc338d674d38f4b2f22b7612cc6a2763ba27 (diff)
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>
-rw-r--r--fs/jfs/jfs_txnmgr.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index ffd4feece078..ce4b4760fcb1 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);