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Date: Tue, 3 Oct 2023 11:26:43 +0200
From: Jan Kara <>
To: "Gustavo A. R. Silva" <>
Cc: Jan Kara <>,,
Subject: Re: [PATCH][next] udf: Fix undefined behavior bug in struct

On Mon 02-10-23 18:14:26, Gustavo A. R. Silva wrote:
> `struct fileIdentDesc` is a flexible structure, which means that it
> contains a flexible-array member at the bottom. This could potentially
> lead to an overwrite of the objects following `fi` in `struct
> udf_fileident_iter` at run-time.
> Fix this by placing the declaration of object `fi` at the end of
> `struct udf_fileident_iter`.
> -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
> ready to enable it globally.
> Fixes: d16076d9b684 ("udf: New directory iteration code")
> Cc:
> Signed-off-by: Gustavo A. R. Silva <>

Thanks for the patch! This is in fact harmless since we never use the
impUse field. But I agree it is confusing so I'll merge attached fix

Jan Kara <>

View attachment "0001-udf-Avoid-unneeded-variable-length-array-in-struct-f.patch" of type "text/x-patch" (1002 bytes)

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