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| author | Immad Mir <mirimmad17@gmail.com> | 2023-06-23 16:47:08 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-26 16:26:44 +0300 |
| commit | 5c094ca994824e038b6a97835ded4e5d1d808504 (patch) | |
| tree | 5c02910a70f68588fe22846ce977ea6538d8c330 /fs/jfs | |
| parent | 2a3f20efe6c901d4c0871cfd1d8c65e2ade71fc1 (diff) | |
| download | linux-5c094ca994824e038b6a97835ded4e5d1d808504.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/jfs')
| -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 c8ce7f1bc594..6f6a5b9203d3 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); |