In the Linux kernel, the following vulnerability has been resolved: f2fs: fix NULL pointer dereference in f2fs_submit_page_write() BUG: kernel NULL pointer dereference, address: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Call Trace: <TASK> ? show_regs+0x6e/0x80 ? __die+0x29/0x70 ? page_fault_oops+0x154/0x4a0 ? prb_read_valid+0x20/0x30 ? __irq_work_queue_local+0x39/0xd0 ? irq_work_queue+0x36/0x70 ? do_user_addr_fault+0x314/0x6c0 ? exc_page_fault+0x7d/0x190 ? asm_exc_page_fault+0x2b/0x30 ? f2fs_submit_page_write+0x6cf/0x780 [f2fs] ? f2fs_submit_page_write+0x736/0x780 [f2fs] do_write_page+0x50/0x170 [f2fs] f2fs_outplace_write_data+0x61/0xb0 [f2fs] f2fs_do_write_data_page+0x3f8/0x660 [f2fs] f2fs_write_single_data_page+0x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] ... It is possible that other threads have added this fio to io->bio and submitted the io->bio before entering f2fs_submit_page_write(). At this point io->bio = NULL. If is_end_zone_blkaddr(sbi, fio->new_blkaddr) of this fio is true, then an NULL pointer dereference error occurs at bio_get(io->bio). The original code for determining zone end was after "out:", which would have missed some fio who is zone end. I've moved this code before "skip:" to make sure it's done for each fio.
| Date Added | Due Date | Vulnerability Name | Required Action |
|---|---|---|---|
| N/A |
| Type | Version | Base score | Base severity | Vector |
|---|---|---|---|---|
| Primary | 3.1 | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Hyperlink | Source | Resource |
|---|---|---|
| https://git.kernel.org/stable/c/4c122a32582b67bdd44ca8d25f894ee2dc54f566 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Patch |
| https://git.kernel.org/stable/c/6d102382a11d5e6035f6c98f6e508a38541f7af3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Patch |
| https://git.kernel.org/stable/c/8e2ea8b04cb8d976110c4568509e67d6a39b2889 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Patch |
| https://git.kernel.org/stable/c/c2034ef6192a65a986a45c2aa2ed05824fdc0e9f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Patch |
| https://git.kernel.org/stable/c/4c122a32582b67bdd44ca8d25f894ee2dc54f566 | af854a3a-2127-422b-91ae-364da2661108 | Patch |
| https://git.kernel.org/stable/c/6d102382a11d5e6035f6c98f6e508a38541f7af3 | af854a3a-2127-422b-91ae-364da2661108 | Patch |
| https://git.kernel.org/stable/c/8e2ea8b04cb8d976110c4568509e67d6a39b2889 | af854a3a-2127-422b-91ae-364da2661108 | Patch |
| https://git.kernel.org/stable/c/c2034ef6192a65a986a45c2aa2ed05824fdc0e9f | af854a3a-2127-422b-91ae-364da2661108 | Patch |