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isofs: Verify inode mode when loading from disk 

commit 0a9e7405131380b57e155f10242b2e25d2e51852 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 928f3a277f2cc1c98c698a3374b06608547f5c7c)
This commit is contained in:
Jan Kara 2025-07-09 11:55:46 +02:00 committed by Wentao Guan
parent 522b5f0fb5
commit 69350ec8e1
1 changed files with 8 additions and 1 deletions
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9
fs/isofs/inode.c
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@ -1486,9 +1486,16 @@ static int isofs_read_inode(struct inode *inode, int relocated)
inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode);
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. */
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;
out: