linux-kernel - Re: [PATCH] ublk: prevent invalid access with DEBUG

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Message-Id: <176418917794.112345.305526865203772039.b4-ty@kernel.dk>
Date: Wed, 26 Nov 2025 13:32:57 -0700
From: Jens Axboe <axboe@...nel.dk>
To: linux-block@...r.kernel.org, Kevin Brodsky <kevin.brodsky@....com>
Cc: linux-kernel@...r.kernel.org, Ali Utku Selen <ali.utku.selen@....com>, 
 Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH] ublk: prevent invalid access with DEBUG


On Wed, 26 Nov 2025 12:48:35 +0000, Kevin Brodsky wrote:
> ublk_ch_uring_cmd_local() may jump to the out label before
> initialising the io pointer. This will cause trouble if DEBUG is
> defined, because the pr_devel() call dereferences io. Clang reports:
> 
> drivers/block/ublk_drv.c:2403:6: error: variable 'io' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
>  2403 |         if (tag >= ub->dev_info.queue_depth)
>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/block/ublk_drv.c:2492:32: note: uninitialized use occurs here
>  2492 |                         __func__, cmd_op, tag, ret, io->flags);
>       |
> 
> [...]

Applied, thanks!

[1/1] ublk: prevent invalid access with DEBUG
      (no commit info)

Best regards,
-- 
Jens Axboe