CVE-2022-50869

In the Linux kernel, the following vulnerability has been resolved:

fs/ntfs3: Fix slab-out-of-bounds in r_page

When PAGE_SIZE is 64K, if read_log_page is called by log_read_rst for

the first time, the size of *buffer would be equal to

DefaultLogPageSize(4K).But for *buffer operations like memcpy,

if the memory area size(n) which being assigned to buffer is larger

than 4K (log->page_size(64K) or bytes(64K-page_off)), it will cause

an out of boundary error.

Call trace:

[...]

kasan_report+0x44/0x130

check_memory_region+0xf8/0x1a0

memcpy+0xc8/0x100

ntfs_read_run_nb+0x20c/0x460

read_log_page+0xd0/0x1f4

log_read_rst+0x110/0x75c

log_replay+0x1e8/0x4aa0

ntfs_loadlog_and_replay+0x290/0x2d0

ntfs_fill_super+0x508/0xec0

get_tree_bdev+0x1fc/0x34c

[...]

Fix this by setting variable r_page to NULL in log_read_rst.