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isofs: Verify inode mode when loading from disk

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Verify that the inode mode is sane when loading it from the disk to
avoid complaints from VFS about setting up invalid inodes.

Reported-by: syzbot+895c23f6917da440ed0d@syzkaller.appspotmail.com
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/20250709095545.31062-2-jack@suse.cz
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Jan Kara 2025-07-09 11:55:46 +02:00 committed by Christian Brauner
parent 6b89819b06
commit 0a9e740513
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 8 additions and 1 deletions
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9
fs/isofs/inode.c
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@ -1440,9 +1440,16 @@ static int isofs_read_inode(struct inode *inode, int relocated)
inode->i_op = &page_symlink_inode_operations; inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode); inode_nohighmem(inode);
inode->i_data.a_ops = &isofs_symlink_aops; inode->i_data.a_ops = &isofs_symlink_aops;
} else } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
/* XXX - parse_rock_ridge_inode() had already set i_rdev. */ /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
init_special_inode(inode, inode->i_mode, inode->i_rdev); init_special_inode(inode, inode->i_mode, inode->i_rdev);
} else {
printk(KERN_DEBUG "ISOFS: Invalid file type 0%04o for inode %lu.\n",
inode->i_mode, inode->i_ino);
ret = -EIO;
goto fail;
}
ret = 0; ret = 0;
out: out: