CVE-2024-56619

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() Syzbot reported that when searching for records in a directory where the inode's i_size is corrupted and has a large value, memory access outside the folio/page range may occur, or a use-after-free bug may be detected if KASAN is enabled. This is because nilfs_last_byte(), which is called by nilfs_find_entry() and others to calculate the number of valid bytes of directory data in a page from i_size and the page index, loses the upper 32 bits of the 64-bit size information due to an inappropriate type of local variable to which the i_size value is assigned. This caused a large byte offset value due to underflow in the end address calculation in the calling nilfs_find_entry(), resulting in memory access that exceeds the folio/page size. Fix this issue by changing the type of the local variable causing the bit loss from "unsigned int" to "u64". The return value of nilfs_last_byte() is also of type "unsigned int", but it is truncated so as not to exceed PAGE_SIZE and no bit loss occurs, so no change is required.

• linux linux kernel (>= 2.6.30 < 5.4.287) • linux linux kernel (>= 5.5 < 5.10.231) • linux linux kernel (>= 5.11 < 5.15.174) • linux linux kernel (>= 5.16 < 6.1.120) • linux linux kernel (>= 6.2 <= 6.6.66) • linux linux kernel (>= 6.7 <= 6.12.5) • linux linux kernel 6.13