fs/9p: fix uninitialized values during inode evict

[ Upstream commit 6630036b ]

If an iget fails due to not being able to retrieve information
from the server then the inode structure is only partially
initialized.  When the inode gets evicted, references to
uninitialized structures (like fscache cookies) were being
made.

This patch checks for a bad_inode before doing anything other
than clearing the inode from the cache.  Since the inode is
bad, it shouldn't have any state associated with it that needs
to be written back (and there really isn't a way to complete
those anyways).

Reported-by:  <syzbot+eb83fe1cce5833cd66a0@syzkaller.appspotmail.com>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
(cherry picked from commit 1b4cb6e9)
[Xiangyu: CVE-2024-36923 Minor conflict resolution due to missing 4eb31178 ]
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/9p/vfs_inode.c

@@ -392,17 +392,20 @@ void v9fs_evict_inode(struct inode *inode)
 	struct v9fs_inode *v9inode = V9FS_I(inode);
 	__le32 version;
 
-	truncate_inode_pages_final(&inode->i_data);
-	version = cpu_to_le32(v9inode->qid.version);
-	fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
+	if (!is_bad_inode(inode)) {
+		truncate_inode_pages_final(&inode->i_data);
+		version = cpu_to_le32(v9inode->qid.version);
+		fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
 				      &version);
-	clear_inode(inode);
-	filemap_fdatawrite(&inode->i_data);
-
-	fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
-	/* clunk the fid stashed in writeback_fid */
-	p9_fid_put(v9inode->writeback_fid);
-	v9inode->writeback_fid = NULL;
+		clear_inode(inode);
+		filemap_fdatawrite(&inode->i_data);
+		if (v9fs_inode_cookie(v9inode))
+			fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
+		/* clunk the fid stashed in writeback_fid */
+		p9_fid_put(v9inode->writeback_fid);
+		v9inode->writeback_fid = NULL;
+	} else
+		clear_inode(inode);
 }
 
 static int v9fs_test_inode(struct inode *inode, void *data)