This is a note to let you know that I've just added the patch titled
isofs: handle CDs with bad root inode but good Joliet root directory
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
isofs-handle-cds-with-bad-root-inode-but-good-joliet.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8a081f1e1dc3eb3ef8db778106e30016c4d00dce
Author: Alex Henrie <alexhenrie24@xxxxxxxxx>
Date: Wed Feb 7 19:21:32 2024 -0700
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 <alexhenrie24@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Message-Id: <20240208022134.451490-1-alexhenrie24@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 2ee21286ac8f0..54075fe3de9b1 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -908,8 +908,22 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
* 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
