From 41405a8d26a9dfd6abd43ff98d4b0c3fd80f7c49 Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Fri, 12 Sep 2025 22:18:44 +0800 Subject: [PATCH] jfs: Verify inode mode when loading from disk ANBZ: #27725 commit fabc1348bb8fe6bc80850014ee94bd89945f7f4d stable. commit 7a5aa54fba2bd591b22b9b624e6baa9037276986 upstream. The inode mode loaded from corrupted disk can be invalid. Do like what commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk") does. Reported-by: syzbot Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d Signed-off-by: Tetsuo Handa Signed-off-by: Dave Kleikamp Signed-off-by: Sasha Levin Fixes: CVE-2025-40312 Signed-off-by: Xiao Long Signed-off-by: Ferry Meng --- fs/jfs/inode.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c index 980aa3300f10..d52332c2eac4 100644 --- a/fs/jfs/inode.c +++ b/fs/jfs/inode.c @@ -59,9 +59,15 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino) */ inode->i_link[inode->i_size] = '\0'; } - } else { + } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) || + S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { inode->i_op = &jfs_file_inode_operations; init_special_inode(inode, inode->i_mode, inode->i_rdev); + } else { + printk(KERN_DEBUG "JFS: Invalid file type 0%04o for inode %lu.\n", + inode->i_mode, inode->i_ino); + iget_failed(inode); + return ERR_PTR(-EIO); } unlock_new_inode(inode); return inode; -- Gitee