CVE-2024-56619

Summary

CVE-2024-56619 is a vulnerability in the Linux kernel that affects the nilfs2 file system. The issue arises due to a potential out-of-bounds memory access in the function nilfs_find_entry(). Syzbot discovered that when the inode's i_size is corrupted and has a large value, memory access outside the folio/page range may occur. This occurs because the local variable to which i_size is assigned in the function nilfs_last_byte() is of an inappropriate type, causing bit loss and a large byte offset value. As a result, memory access exceeds the folio/page size. This vulnerability is fixed by changing the type of the local variable causing the bit loss from "unsigned int" to "u64". Although the return value of nilfs_last_byte() is also of type "unsigned int" and gets truncated, no change is required as no bit loss occurs in this case.

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