From: Arnd Bergmann Date: Thu, 14 Mar 2019 09:09:44 +0000 (+0100) Subject: crypto: ccree - reduce kernel stack usage with clang X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=5db46ac29a6797541943d3c4081821747e342732;p=openwrt%2Fstaging%2Fblogic.git crypto: ccree - reduce kernel stack usage with clang Building with clang for a 32-bit architecture runs over the stack frame limit in the setkey function: drivers/crypto/ccree/cc_cipher.c:318:12: error: stack frame size of 1152 bytes in function 'cc_cipher_setkey' [-Werror,-Wframe-larger-than=] The problem is that there are two large variables: the temporary 'tmp' array and the SHASH_DESC_ON_STACK() declaration. Moving the first into the block in which it is used reduces the total frame size to 768 bytes, which seems more reasonable and is under the warning limit. Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support") Signed-off-by: Arnd Bergmann Acked-By: Gilad Ben-Yossef Signed-off-by: Herbert Xu --- diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c index d9c17078517b..0abcdc224ab0 100644 --- a/drivers/crypto/ccree/cc_cipher.c +++ b/drivers/crypto/ccree/cc_cipher.c @@ -321,7 +321,6 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key, struct crypto_tfm *tfm = crypto_skcipher_tfm(sktfm); struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm); struct device *dev = drvdata_to_dev(ctx_p->drvdata); - u32 tmp[DES3_EDE_EXPKEY_WORDS]; struct cc_crypto_alg *cc_alg = container_of(tfm->__crt_alg, struct cc_crypto_alg, skcipher_alg.base); @@ -347,6 +346,7 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key, * HW does the expansion on its own. */ if (ctx_p->flow_mode == S_DIN_to_DES) { + u32 tmp[DES3_EDE_EXPKEY_WORDS]; if (keylen == DES3_EDE_KEY_SIZE && __des3_ede_setkey(tmp, &tfm->crt_flags, key, DES3_EDE_KEY_SIZE)) {