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jfs: Verify inode mode when loading from disk

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[ Upstream commit 7a5aa54fba2bd591b22b9b624e6baa9037276986 ]

The inode mode loaded from corrupted disk can be invalid. Do like what
commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk")
does.

Reported-by: syzbot <syzbot+895c23f6917da440ed0d@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tetsuo Handa 2025-09-12 23:18:44 +09:00 • committed by Greg Kroah-Hartman
commit 19cce65709
1 changed files with 7 additions and 1 deletions
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8
fs/jfs/inode.c
View file

@ -59,9 +59,15 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
*/
inode->i_link[inode->i_size] = '\0';
}
} else {
} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
inode->i_op = &jfs_file_inode_operations;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
} else {
printk(KERN_DEBUG "JFS: Invalid file type 0%04o for inode %lu.\n",
inode->i_mode, inode->i_ino);
iget_failed(inode);
return ERR_PTR(-EIO);
}
unlock_new_inode(inode);
return inode;