diff options
author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-24 19:21:00 +0300 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-03-06 04:28:21 +0300 |
commit | 5a8a076506af03f83f83d80412a7c0b06b687ee1 (patch) | |
tree | 3748195e05adfc39d2516d7d077d782067a290a1 /drivers | |
parent | d282eeeb112a00b05595a034ac4cae8532a4c2fc (diff) | |
download | linux-5a8a076506af03f83f83d80412a7c0b06b687ee1.tar.xz |
crypto: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/crypto/caam/caamalg.c | 2 | ||||
-rw-r--r-- | drivers/crypto/caam/caamalg_qi.c | 4 | ||||
-rw-r--r-- | drivers/crypto/caam/caamalg_qi2.h | 6 | ||||
-rw-r--r-- | drivers/crypto/caam/caamhash.c | 2 | ||||
-rw-r--r-- | drivers/crypto/cavium/nitrox/nitrox_main.c | 2 | ||||
-rw-r--r-- | drivers/crypto/chelsio/chcr_core.h | 2 | ||||
-rw-r--r-- | drivers/crypto/mediatek/mtk-sha.c | 2 | ||||
-rw-r--r-- | drivers/crypto/nx/nx.h | 2 | ||||
-rw-r--r-- | drivers/crypto/omap-sham.c | 4 |
9 files changed, 13 insertions, 13 deletions
diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c index 03797f9b1050..b7bb7c30adeb 100644 --- a/drivers/crypto/caam/caamalg.c +++ b/drivers/crypto/caam/caamalg.c @@ -909,7 +909,7 @@ struct skcipher_edesc { bool bklog; dma_addr_t sec4_sg_dma; struct sec4_sg_entry *sec4_sg; - u32 hw_desc[0]; + u32 hw_desc[]; }; static void caam_unmap(struct device *dev, struct scatterlist *src, diff --git a/drivers/crypto/caam/caamalg_qi.c b/drivers/crypto/caam/caamalg_qi.c index 4a29e0ef9d63..27e36bdf6163 100644 --- a/drivers/crypto/caam/caamalg_qi.c +++ b/drivers/crypto/caam/caamalg_qi.c @@ -783,7 +783,7 @@ struct aead_edesc { unsigned int assoclen; dma_addr_t assoclen_dma; struct caam_drv_req drv_req; - struct qm_sg_entry sgt[0]; + struct qm_sg_entry sgt[]; }; /* @@ -803,7 +803,7 @@ struct skcipher_edesc { int qm_sg_bytes; dma_addr_t qm_sg_dma; struct caam_drv_req drv_req; - struct qm_sg_entry sgt[0]; + struct qm_sg_entry sgt[]; }; static struct caam_drv_ctx *get_drv_ctx(struct caam_ctx *ctx, diff --git a/drivers/crypto/caam/caamalg_qi2.h b/drivers/crypto/caam/caamalg_qi2.h index 706736776b47..f29cb7bd7dd3 100644 --- a/drivers/crypto/caam/caamalg_qi2.h +++ b/drivers/crypto/caam/caamalg_qi2.h @@ -114,7 +114,7 @@ struct aead_edesc { dma_addr_t qm_sg_dma; unsigned int assoclen; dma_addr_t assoclen_dma; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /* @@ -132,7 +132,7 @@ struct skcipher_edesc { dma_addr_t iv_dma; int qm_sg_bytes; dma_addr_t qm_sg_dma; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /* @@ -146,7 +146,7 @@ struct ahash_edesc { dma_addr_t qm_sg_dma; int src_nents; int qm_sg_bytes; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /** diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c index 2fe852853d40..943bc0296267 100644 --- a/drivers/crypto/caam/caamhash.c +++ b/drivers/crypto/caam/caamhash.c @@ -536,7 +536,7 @@ struct ahash_edesc { int sec4_sg_bytes; bool bklog; u32 hw_desc[DESC_JOB_IO_LEN_MAX / sizeof(u32)] ____cacheline_aligned; - struct sec4_sg_entry sec4_sg[0]; + struct sec4_sg_entry sec4_sg[]; }; static inline void ahash_unmap(struct device *dev, diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c index c4632d84c9a1..e91be9b8b083 100644 --- a/drivers/crypto/cavium/nitrox/nitrox_main.c +++ b/drivers/crypto/cavium/nitrox/nitrox_main.c @@ -71,7 +71,7 @@ struct ucode { char version[VERSION_LEN - 1]; __be32 code_size; u8 raz[12]; - u64 code[0]; + u64 code[]; }; /** diff --git a/drivers/crypto/chelsio/chcr_core.h b/drivers/crypto/chelsio/chcr_core.h index e51c138b0a51..a4b9337cbf2c 100644 --- a/drivers/crypto/chelsio/chcr_core.h +++ b/drivers/crypto/chelsio/chcr_core.h @@ -68,7 +68,7 @@ struct _key_ctx { __be32 ctx_hdr; u8 salt[MAX_SALT]; __be64 iv_to_auth; - unsigned char key[0]; + unsigned char key[]; }; #define KEYCTX_TX_WR_IV_S 55 diff --git a/drivers/crypto/mediatek/mtk-sha.c b/drivers/crypto/mediatek/mtk-sha.c index 9e9f48bb7f85..bd6309e57ab8 100644 --- a/drivers/crypto/mediatek/mtk-sha.c +++ b/drivers/crypto/mediatek/mtk-sha.c @@ -107,7 +107,7 @@ struct mtk_sha_ctx { u8 id; u8 buf[SHA_BUF_SIZE] __aligned(sizeof(u32)); - struct mtk_sha_hmac_ctx base[0]; + struct mtk_sha_hmac_ctx base[]; }; struct mtk_sha_drv { diff --git a/drivers/crypto/nx/nx.h b/drivers/crypto/nx/nx.h index 91c54289124a..c6233173c612 100644 --- a/drivers/crypto/nx/nx.h +++ b/drivers/crypto/nx/nx.h @@ -37,7 +37,7 @@ struct max_sync_cop { u32 fc; u32 mode; u32 triplets; - struct msc_triplet trip[0]; + struct msc_triplet trip[]; } __packed; struct alg_props { diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 4f915a4ef5b0..e4072cd38585 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -159,7 +159,7 @@ struct omap_sham_reqctx { int sg_len; unsigned int total; /* total request */ - u8 buffer[0] OMAP_ALIGNED; + u8 buffer[] OMAP_ALIGNED; }; struct omap_sham_hmac_ctx { @@ -176,7 +176,7 @@ struct omap_sham_ctx { /* fallback stuff */ struct crypto_shash *fallback; - struct omap_sham_hmac_ctx base[0]; + struct omap_sham_hmac_ctx base[]; }; #define OMAP_SHAM_QUEUE_LENGTH 10 |