CVE-2023-52852

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

f2fs: compress: fix to avoid use-after-free on dic

Call trace: __memcpy+0x128/0x250 f2fs_read_multi_pages+0x940/0xf7c f2fs_mpage_readpages+0x5a8/0x624 f2fs_readahead+0x5c/0x110 page_cache_ra_unbounded+0x1b8/0x590 do_sync_mmap_readahead+0x1dc/0x2e4 filemap_fault+0x254/0xa8c f2fs_filemap_fault+0x2c/0x104 __do_fault+0x7c/0x238 do_handle_mm_fault+0x11bc/0x2d14 do_mem_abort+0x3a8/0x1004 el0_da+0x3c/0xa0 el0t_64_sync_handler+0xc4/0xec el0t_64_sync+0x1b4/0x1b8

In f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if we hit cached page in compress_inodes cache, dic may be released, it needs break the loop rather than continuing it, in order to avoid accessing invalid dic pointer.

Affected Software

References

• https://git.kernel.org/stable/c/8c4504cc0c64862740a6acb301e0cfa59580dbc5
• https://git.kernel.org/stable/c/932ddb5c29e884cc6fac20417ece72ba4a35c401
• https://git.kernel.org/stable/c/9375ea7f269093d7c884857ae1f47633a91f429c
• https://git.kernel.org/stable/c/9d065aa52b6ee1b06f9c4eca881c9b4425a12ba2
• https://git.kernel.org/stable/c/b0327c84e91a0f4f0abced8cb83ec86a7083f086