-Wflex-array-member-not-at-end is coming in GCC-14, and we are getting ready to enable it globally. Use the `__struct_group()` helper to separate the flexible array from the rest of the members in flexible `struct nx842_crypto_header`, through tagged `struct nx842_crypto_header_hdr`, and avoid embedding the flexible-array member in the middle of `struct nx842_crypto_ctx`. Also, use `container_of()` whenever we need to retrieve a pointer to the flexible structure. This code was detected with the help of Coccinelle, and audited and modified manually. Link: https://github.com/KSPP/linux/issues/202 Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> --- drivers/crypto/nx/nx-842.c | 6 ++++-- drivers/crypto/nx/nx-842.h | 11 +++++++---- 2 files changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c index 2ab90ec10e61..82214cde2bcd 100644 --- a/drivers/crypto/nx/nx-842.c +++ b/drivers/crypto/nx/nx-842.c @@ -251,7 +251,9 @@ int nx842_crypto_compress(struct crypto_tfm *tfm, u8 *dst, unsigned int *dlen) { struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); - struct nx842_crypto_header *hdr = &ctx->header; + struct nx842_crypto_header *hdr = + container_of(&ctx->header, + struct nx842_crypto_header, hdr); struct nx842_crypto_param p; struct nx842_constraints c = *ctx->driver->constraints; unsigned int groups, hdrsize, h; @@ -490,7 +492,7 @@ int nx842_crypto_decompress(struct crypto_tfm *tfm, } memcpy(&ctx->header, src, hdr_len); - hdr = &ctx->header; + hdr = container_of(&ctx->header, struct nx842_crypto_header, hdr); for (n = 0; n < hdr->groups; n++) { /* ignore applies to last group */ diff --git a/drivers/crypto/nx/nx-842.h b/drivers/crypto/nx/nx-842.h index 7590bfb24d79..1f42c83d2683 100644 --- a/drivers/crypto/nx/nx-842.h +++ b/drivers/crypto/nx/nx-842.h @@ -157,9 +157,12 @@ struct nx842_crypto_header_group { } __packed; struct nx842_crypto_header { - __be16 magic; /* NX842_CRYPTO_MAGIC */ - __be16 ignore; /* decompressed end bytes to ignore */ - u8 groups; /* total groups in this header */ + /* New members must be added within the __struct_group() macro below. */ + __struct_group(nx842_crypto_header_hdr, hdr, __packed, + __be16 magic; /* NX842_CRYPTO_MAGIC */ + __be16 ignore; /* decompressed end bytes to ignore */ + u8 groups; /* total groups in this header */ + ); struct nx842_crypto_header_group group[]; } __packed; @@ -171,7 +174,7 @@ struct nx842_crypto_ctx { u8 *wmem; u8 *sbounce, *dbounce; - struct nx842_crypto_header header; + struct nx842_crypto_header_hdr header; struct nx842_crypto_header_group group[NX842_CRYPTO_GROUP_MAX]; struct nx842_driver *driver; -- 2.34.1
