[PATCH 3/9] crypto, null: Implement zbufsize()
From: Kees Cook <hidden>
Date: 2018-08-02 21:51:28
Also in:
lkml
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
This implements the worst-case compression size querying interface for the "null" compression implementation (i.e. no change in size). Signed-off-by: Kees Cook <redacted> --- crypto/crypto_null.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
index 20ff2c746e0b..d1b6107f8443 100644
--- a/crypto/crypto_null.c
+++ b/crypto/crypto_null.c@@ -39,6 +39,13 @@ static int null_compress(struct crypto_tfm *tfm, const u8 *src, return 0; } +static int null_zbufsize(struct crypto_tfm *tfm, unsigned int slen, + unsigned int *dlen) +{ + *dlen = slen; + return 0; +} + static int null_init(struct shash_desc *desc) { return 0;
@@ -146,7 +153,8 @@ static struct crypto_alg null_algs[3] = { { .cra_module = THIS_MODULE, .cra_u = { .compress = { .coa_compress = null_compress, - .coa_decompress = null_compress } } + .coa_decompress = null_compress, + .coa_zbufsize = null_zbufsize } } } }; MODULE_ALIAS_CRYPTO("compress_null");
--
2.17.1