Commit 2a8807f9 authored Jun 23, 2023 by Immad Mir Committed by Greg Kroah-Hartman Aug 30, 2023

FS: JFS: Check for read-only mounted filesystem in txBegin



[ 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>

parent a7d17d6b

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);