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

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[ 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>
This commit is contained in:
Immad Mir 2023-06-23 19:17:08 +05:30 committed by Greg Kroah-Hartman
parent 3e5eb6c5ec
commit aa7cdf487a
1 changed files with 5 additions and 0 deletions
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5
fs/jfs/jfs_txnmgr.c
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@ -354,6 +354,11 @@ tid_t txBegin(struct super_block *sb, int flag)
jfs_info("txBegin: flag = 0x%x", flag); jfs_info("txBegin: flag = 0x%x", flag);
log = JFS_SBI(sb)->log; log = JFS_SBI(sb)->log;
if (!log) {
jfs_error(sb, "read-only filesystem\n");
return 0;
}
TXN_LOCK(); TXN_LOCK();
INCREMENT(TxStat.txBegin); INCREMENT(TxStat.txBegin);