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Message-ID: <ZRrsYkKIQe8K6F/t@work> Date: Mon, 2 Oct 2023 18:14:26 +0200 From: "Gustavo A. R. Silva" <gustavoars@...nel.org> To: Jan Kara <jack@...e.com> Cc: linux-kernel@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-hardening@...r.kernel.org Subject: [PATCH][next] udf: Fix undefined behavior bug in struct udf_fileident_iter `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: stable@...r.kernel.org Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> --- fs/udf/udfdecl.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h index 88692512a466..736f591abc89 100644 --- a/fs/udf/udfdecl.h +++ b/fs/udf/udfdecl.h @@ -93,11 +93,11 @@ struct udf_fileident_iter { sector_t loffset; /* Block offset of 'pos' within above * extent */ struct extent_position epos; /* Position after the above extent */ - struct fileIdentDesc fi; /* Copied directory entry */ uint8_t *name; /* Pointer to entry name */ uint8_t *namebuf; /* Storage for entry name in case * the name is split between two blocks */ + struct fileIdentDesc fi; /* Copied directory entry */ }; struct udf_vds_record { -- 2.34.1
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