[PATCH 8/9] crypto, lz4hc: Implement zbufsize()
From: Kees Cook <hidden>
Date: 2018-08-02 21:51:35
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 lz4hc, based on the logic originally used by pstore. Signed-off-by: Kees Cook <redacted> --- crypto/lz4hc.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c
index 2be14f054daf..cf6f38a1c35b 100644
--- a/crypto/lz4hc.c
+++ b/crypto/lz4hc.c@@ -118,6 +118,24 @@ static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL); } +static int __lz4hc_zbufsize_crypto(unsigned int slen, unsigned int *dlen) +{ + *dlen = LZ4_compressBound(slen); + return 0; +} + +static int lz4hc_szbufsize(struct crypto_scomp *tfm, unsigned int slen, + unsigned int *dlen, void *ctx) +{ + return __lz4hc_zbufsize_crypto(slen, dlen); +} + +static int lz4hc_zbufsize_crypto(struct crypto_tfm *tfm, unsigned int slen, + unsigned int *dlen) +{ + return __lz4hc_zbufsize_crypto(slen, dlen); +} + static struct crypto_alg alg_lz4hc = { .cra_name = "lz4hc", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@@ -128,7 +146,8 @@ static struct crypto_alg alg_lz4hc = { .cra_exit = lz4hc_exit, .cra_u = { .compress = { .coa_compress = lz4hc_compress_crypto, - .coa_decompress = lz4hc_decompress_crypto } } + .coa_decompress = lz4hc_decompress_crypto, + .coa_zbufsize = lz4hc_zbufsize_crypto } } }; static struct scomp_alg scomp = {
@@ -136,6 +155,7 @@ static struct scomp_alg scomp = { .free_ctx = lz4hc_free_ctx, .compress = lz4hc_scompress, .decompress = lz4hc_sdecompress, + .zbufsize = lz4hc_szbufsize, .base = { .cra_name = "lz4hc", .cra_driver_name = "lz4hc-scomp",
--
2.17.1