CVE-2023-52852

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> f2fs: compress: fix to avoid use-after-free on dic<br /> <br /> Call trace:<br /> __memcpy+0x128/0x250<br /> f2fs_read_multi_pages+0x940/0xf7c<br /> f2fs_mpage_readpages+0x5a8/0x624<br /> f2fs_readahead+0x5c/0x110<br /> page_cache_ra_unbounded+0x1b8/0x590<br /> do_sync_mmap_readahead+0x1dc/0x2e4<br /> filemap_fault+0x254/0xa8c<br /> f2fs_filemap_fault+0x2c/0x104<br /> __do_fault+0x7c/0x238<br /> do_handle_mm_fault+0x11bc/0x2d14<br /> do_mem_abort+0x3a8/0x1004<br /> el0_da+0x3c/0xa0<br /> el0t_64_sync_handler+0xc4/0xec<br /> el0t_64_sync+0x1b4/0x1b8<br /> <br /> In f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if<br /> we hit cached page in compress_inode&amp;#39;s cache, dic may be released, it needs<br /> break the loop rather than continuing it, in order to avoid accessing<br /> invalid dic pointer.