Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.15 23/23] FS: JFS: Check for read-only mounted filesystem in txBegin | Date | Sun, 23 Jul 2023 21:23:34 -0400 |
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From: Immad Mir <mirimmad17@gmail.com>
[ 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> --- fs/jfs/jfs_txnmgr.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c index 042bbe6d8ac2e..6c8680d3907af 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); -- 2.39.2
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