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jfs: add check read-only before txBeginAnon() call

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[ Upstream commit 0176e69743 ]

Added a read-only check before calling `txBeginAnon` in `extAlloc`
and `extRecord`. This prevents modification attempts on a read-only
mounted filesystem, avoiding potential errors or crashes.

Call trace:
 txBeginAnon+0xac/0x154
 extAlloc+0xe8/0xdec fs/jfs/jfs_extent.c:78
 jfs_get_block+0x340/0xb98 fs/jfs/inode.c:248
 __block_write_begin_int+0x580/0x166c fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2236
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:299

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot+4e89b5368baba8324e07@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=4e89b5368baba8324e07
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vasiliy Kovalev
2026-09-02 14:29:16 +02:00
committed by Greg Kroah-Hartman
parent 41da1715cd
commit 47a99881ec
1 changed files with 10 additions and 0 deletions
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fs/jfs/jfs_extent.c
+10
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@@ -74,6 +74,11 @@ extAlloc(struct inode *ip, s64 xlen, s64 pno, xad_t * xp, bool abnr)
int rc;
int xflag;
if (isReadOnly(ip)) {
jfs_error(ip->i_sb, "read-only filesystem\n");
return -EIO;
}
/* This blocks if we are low on resources */
txBeginAnon(ip->i_sb);
@@ -253,6 +258,11 @@ int extRecord(struct inode *ip, xad_t * xp)
{
int rc;
if (isReadOnly(ip)) {
jfs_error(ip->i_sb, "read-only filesystem\n");
return -EIO;
}
txBeginAnon(ip->i_sb);
mutex_lock(&JFS_IP(ip)->commit_mutex);