On Thu, 18 Jul 2024 20:00:53 +0100, Pavel Begunkov wrote:
> Syz reports a problem, which boils down to NULL vs IS_ERR inconsistent
> error handling in io_alloc_pbuf_ring().
>
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> RIP: 0010:__io_remove_buffers+0xac/0x700 io_uring/kbuf.c:341
> Call Trace:
> <TASK>
> io_put_bl io_uring/kbuf.c:378 [inline]
> io_destroy_buffers+0x14e/0x490 io_uring/kbuf.c:392
> io_ring_ctx_free+0xa00/0x1070 io_uring/io_uring.c:2613
> io_ring_exit_work+0x80f/0x8a0 io_uring/io_uring.c:2844
> process_one_work kernel/workqueue.c:3231 [inline]
> process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
> kthread+0x2f0/0x390 kernel/kthread.c:389
> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>
> [...]
Applied, thanks!
[1/1] io_uring: fix error pbuf checking
commit: 77feb9505ce67fc609b1e7b6b27b41995370498f
Best regards,
--
Jens Axboe
