Unverified Commit 7f9d34b0 authored by Tetsuo Handa's avatar Tetsuo Handa Committed by Christian Brauner
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cramfs: Verify inode mode when loading from disk 



The inode mode loaded from corrupted disk can be invalid. Do like what
commit 0a9e7405 ("isofs: Verify inode mode when loading from disk")
does.

Reported-by: default avatarsyzbot <syzbot+895c23f6917da440ed0d@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d


Signed-off-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Link: https://lore.kernel.org/429b3ef1-13de-4310-9a8e-c2dc9a36234a@I-love.SAKURA.ne.jp


Acked-by: default avatarNicolas Pitre <nico@fluxnic.net>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent e5bca063

fs/cramfs/inode.c

+10 −1
Original line number Diff line number Diff line
@@ -116,9 +116,18 @@ static struct inode *get_cramfs_inode(struct super_block *sb, 
		inode_nohighmem(inode);

		inode->i_data.a_ops = &cramfs_aops;

		break;

	default:

	case S_IFCHR:

	case S_IFBLK:

	case S_IFIFO:

	case S_IFSOCK:

		init_special_inode(inode, cramfs_inode->mode,

				old_decode_dev(cramfs_inode->size));

		break;

	default:

		printk(KERN_DEBUG "CRAMFS: Invalid file type 0%04o for inode %lu.\n",

		       inode->i_mode, inode->i_ino);

		iget_failed(inode);

		return ERR_PTR(-EIO);

	}



	inode->i_mode = cramfs_inode->mode;