From b02e6ba55997926c961a95cdaf9de91f75b0b5c3 Mon Sep 17 00:00:00 2001 From: Alex Henrie Date: Wed, 7 Feb 2024 19:21:32 -0700 Subject: isofs: handle CDs with bad root inode but good Joliet root directory [ Upstream commit 4243bf80c79211a8ca2795401add9c4a3b1d37ca ] I have a CD copy of the original Tom Clancy's Ghost Recon game from 2001. The disc mounts without error on Windows, but on Linux mounting fails with the message "isofs_fill_super: get root inode failed". The error originates in isofs_read_inode, which returns -EIO because de_len is 0. The superblock on this disc appears to be intentionally corrupt as a form of copy protection. When the root inode is unusable, instead of giving up immediately, try to continue with the Joliet file table. This fixes the Ghost Recon CD and probably other copy-protected CDs too. Signed-off-by: Alex Henrie Signed-off-by: Jan Kara Message-Id: <20240208022134.451490-1-alexhenrie24@gmail.com> Signed-off-by: Sasha Levin --- fs/isofs/inode.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index 6e4e2cfd40b9..aec11a7676c9 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -910,8 +910,22 @@ root_found: * we then decide whether to use the Joliet descriptor. */ inode = isofs_iget(s, sbi->s_firstdatazone, 0); - if (IS_ERR(inode)) - goto out_no_root; + + /* + * Fix for broken CDs with a corrupt root inode but a correct Joliet + * root directory. + */ + if (IS_ERR(inode)) { + if (joliet_level && sbi->s_firstdatazone != first_data_zone) { + printk(KERN_NOTICE + "ISOFS: root inode is unusable. " + "Disabling Rock Ridge and switching to Joliet."); + sbi->s_rock = 0; + inode = NULL; + } else { + goto out_no_root; + } + } /* * Fix for broken CDs with Rock Ridge and empty ISO root directory but -- cgit v1.2.3