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| author | Immad Mir <mirimmad17@gmail.com> | 2023-06-23 16:47:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 09:50:33 +0300 |
| commit | aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c (patch) | |
| tree | fe816577282c7622f6f45cd1d5791c8a542c4bfd /fs | |
| parent | 3e5eb6c5ecd8ddb9cfea751cf30f9e23eac97ca3 (diff) | |
| download | linux-aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c.tar.xz | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/jfs/jfs_txnmgr.c | 5 |
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); |