High · published May 21, 2024
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_inode's cache, dic may be released, it needs
break the loop rather than continuing it, in order to avoid accessing
invalid dic pointer.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 5.13.19, < 5.15.139 | 5.15.139 |
| linux/linux_kernel | ≥ 5.16, < 6.1.63 | 6.1.63 |
| linux/linux_kernel | ≥ 6.2, < 6.5.12 | 6.5.12 |
| linux/linux_kernel | ≥ 6.6, < 6.6.2 | 6.6.2 |