Re: [PATCH] io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get()

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On Tue, 21 Mar 2023 19:44:02 +0000, Savino Dicanosa wrote:
> When fixed files are unregistered, file_alloc_end and alloc_hint
> are not cleared. This can later cause a NULL pointer dereference in
> io_file_bitmap_get() if auto index selection is enabled via
> IORING_FILE_INDEX_ALLOC:
> 
> [    6.519129] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [...]
> [    6.541468] RIP: 0010:_find_next_zero_bit+0x1a/0x70
> [...]
> [    6.560906] Call Trace:
> [    6.561322]  <TASK>
> [    6.561672]  io_file_bitmap_get+0x38/0x60
> [    6.562281]  io_fixed_fd_install+0x63/0xb0
> [    6.562851]  ? __pfx_io_socket+0x10/0x10
> [    6.563396]  io_socket+0x93/0xf0
> [    6.563855]  ? __pfx_io_socket+0x10/0x10
> [    6.564411]  io_issue_sqe+0x5b/0x3d0
> [    6.564914]  io_submit_sqes+0x1de/0x650
> [    6.565452]  __do_sys_io_uring_enter+0x4fc/0xb20
> [    6.566083]  ? __do_sys_io_uring_register+0x11e/0xd80
> [    6.566779]  do_syscall_64+0x3c/0x90
> [    6.567247]  entry_SYSCALL_64_after_hwframe+0x72/0xdc
> [...]
> 
> [...]

Applied, thanks!

[1/1] io_uring/rsrc: fix null-ptr-deref in io_file_bitmap_get()
      commit: 761efd55a0227aca3a69deacdaa112fffd44fe37

Best regards,
-- 
Jens Axboe






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