Re: [PATCH] block: fix potential invalid pointer dereference in blk_add_partition

[Bart Van Assche <bvanassche@acm.org>]

On 9/8/24 10:10 AM, Riyan Dhiman wrote:
> The blk_add_partition() function initially used a single if-condition
> (IS_ERR(part)) to check for errors when adding a partition. This was
> modified to handle the specific case of -ENXIO separately, allowing the
> function to proceed without logging the error in this case. However,
> this change unintentionally left a path where md_autodetect_dev()
> could be called without confirming that part is a valid pointer.
> 
> This commit separates the error handling logic by splitting the
> initial if-condition, improving code readability and handling specific
> error scenarios explicitly. The function now distinguishes the general
> error case from -ENXIO without altering the existing behavior of
> md_autodetect_dev() calls.
> 
> Fixes: b72053072c0b (block: allow partitions on host aware zone devices)
> 
> Signed-off-by: Riyan Dhiman <riyandhiman14@gmail.com>

No blank line between the Fixes: and Signed-off-by: tags please.
Additionally, please Cc the author of a patch when posting a fix for a
patch.

Thanks,

Bart.