Re: [PATCH] io_uring: fix error handling for io_uring_cmd

[Kanchan Joshi <joshi.k@samsung.com>]

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On Thu, Aug 11, 2022 at 10:55:29AM -0600, Jens Axboe wrote:
>On 8/11/22 9:38 AM, Jens Axboe wrote:
>> On Thu, 11 Aug 2022 14:44:59 +0530, Anuj Gupta wrote:
>>> Commit 97b388d70b53 ("io_uring: handle completions in the core") moved the
>>> error handling from handler to core. But for io_uring_cmd handler we end
>>> up completing more than once (both in handler and in core) leading to
>>> use_after_free.
>>> Change io_uring_cmd handler to avoid calling io_uring_cmd_done in case
>>> of error.
>>>
>>> [...]
>>
>> Applied, thanks!
>>
>> [1/1] io_uring: fix error handling for io_uring_cmd
>>       commit: f1bb0fd63c374e1410ff05fb434aa78e1ce09ae4
>
>Ehm, did you compile this:
Sorry. Version that landed here got a upgrade in
commit-description but downgrade in this part :-(

BTW, we noticed the original issue while testing fixedbufs support.
Thinking to add a liburing test that involves sending a command which
nvme will fail during submission. Can come in handy.

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