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crypto: nx - Use static_assert() to check struct sizes

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Commit 1e6b251ce1 ("crypto: nx - Avoid -Wflex-array-member-not-at-end
warning") introduced tagged `struct nx842_crypto_header_hdr`. We want
to ensure that when new members need to be added to the flexible
structure, they are always included within this tagged struct.

So, we use `static_assert()` to ensure that the memory layout for
both the flexible structure and the tagged struct is the same after
any changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gustavo A. R. Silva 2024-08-08 16:09:06 -06:00 committed by Herbert Xu
parent 8caa061cfd
commit f2f853e7ae
1 changed files with 3 additions and 0 deletions
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3
drivers/crypto/nx/nx-842.h
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@ -157,6 +157,7 @@ struct nx842_crypto_header_group {
} __packed;
struct nx842_crypto_header {
/* New members MUST be added within the struct_group() macro below. */
struct_group_tagged(nx842_crypto_header_hdr, hdr,
__be16 magic; /* NX842_CRYPTO_MAGIC */
__be16 ignore; /* decompressed end bytes to ignore */
@ -164,6 +165,8 @@ struct nx842_crypto_header {
);
struct nx842_crypto_header_group group[];
} __packed;
static_assert(offsetof(struct nx842_crypto_header, group) == sizeof(struct nx842_crypto_header_hdr),
"struct member likely outside of struct_group_tagged()");
#define NX842_CRYPTO_GROUP_MAX (0x20)