Commit 95e2b352 authored by Immad Mir's avatar Immad Mir Committed by Dave Kleikamp
Browse files

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: default avatarImmad Mir <mirimmad17@gmail.com>
Signed-off-by: default avatarDave Kleikamp <dave.kleikamp@oracle.com>
parent 47cfdc33

fs/jfs/jfs_txnmgr.c

+5 −0
Original line number Diff line number Diff line
@@ -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);