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cramfs: Verify inode mode when loading from disk

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[ Upstream commit 7f9d34b0a7 ]

The inode mode loaded from corrupted disk can be invalid. Do like what
commit 0a9e740513 ("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>
Link: https://lore.kernel.org/429b3ef1-13de-4310-9a8e-c2dc9a36234a@I-love.SAKURA.ne.jp
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tetsuo Handa
2025-08-30 19:01:01 +09:00
committed by Greg Kroah-Hartman
parent a05855302b
commit 4bdabd52ca
1 changed files with 10 additions and 1 deletions
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11
fs/cramfs/inode.c
View File

@@ -117,9 +117,18 @@ 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;