Re: [PATCH net] net: ena: fix shift-out-of-bounds in exponential backoff

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Mon, 10 Jul 2023 18:36:21 -0700 you wrote:
> The ENA adapters on our instances occasionally reset.  Once recently
> logged a UBSAN failure to console in the process:
> 
>   UBSAN: shift-out-of-bounds in build/linux/drivers/net/ethernet/amazon/ena/ena_com.c:540:13
>   shift exponent 32 is too large for 32-bit type 'unsigned int'
>   CPU: 28 PID: 70012 Comm: kworker/u72:2 Kdump: loaded not tainted 5.15.117
>   Hardware name: Amazon EC2 c5d.9xlarge/, BIOS 1.0 10/16/2017
>   Workqueue: ena ena_fw_reset_device [ena]
>   Call Trace:
>   <TASK>
>   dump_stack_lvl+0x4a/0x63
>   dump_stack+0x10/0x16
>   ubsan_epilogue+0x9/0x36
>   __ubsan_handle_shift_out_of_bounds.cold+0x61/0x10e
>   ? __const_udelay+0x43/0x50
>   ena_delay_exponential_backoff_us.cold+0x16/0x1e [ena]
>   wait_for_reset_state+0x54/0xa0 [ena]
>   ena_com_dev_reset+0xc8/0x110 [ena]
>   ena_down+0x3fe/0x480 [ena]
>   ena_destroy_device+0xeb/0xf0 [ena]
>   ena_fw_reset_device+0x30/0x50 [ena]
>   process_one_work+0x22b/0x3d0
>   worker_thread+0x4d/0x3f0
>   ? process_one_work+0x3d0/0x3d0
>   kthread+0x12a/0x150
>   ? set_kthread_struct+0x50/0x50
>   ret_from_fork+0x22/0x30
>   </TASK>
> 
> [...]

Here is the summary with links:
  - [net] net: ena: fix shift-out-of-bounds in exponential backoff
    https://git.kernel.org/netdev/net/c/1e9cb763e9ba

You are awesome, thank you!
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