[PATCH 7/9] crypto, lz4: Implement zbufsize()
From: Kees Cook <hidden>
Date: 2018-08-02 21:51:57
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 lz4, based on the logic originally used by pstore. Signed-off-by: Kees Cook <redacted> --- crypto/lz4.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/crypto/lz4.c b/crypto/lz4.c
index 2ce2660d3519..42003d080967 100644
--- a/crypto/lz4.c
+++ b/crypto/lz4.c@@ -117,6 +117,24 @@ static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src, return __lz4_decompress_crypto(src, slen, dst, dlen, NULL); } +static int __lz4_zbufsize_crypto(unsigned int slen, unsigned int *dlen) +{ + *dlen = LZ4_compressBound(slen); + return 0; +} + +static int lz4_szbufsize(struct crypto_scomp *tfm, unsigned int slen, + unsigned int *dlen, void *ctx) +{ + return __lz4_zbufsize_crypto(slen, dlen); +} + +static int lz4_zbufsize_crypto(struct crypto_tfm *tfm, unsigned int slen, + unsigned int *dlen) +{ + return __lz4_zbufsize_crypto(slen, dlen); +} + static struct crypto_alg alg_lz4 = { .cra_name = "lz4", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@@ -127,7 +145,8 @@ static struct crypto_alg alg_lz4 = { .cra_exit = lz4_exit, .cra_u = { .compress = { .coa_compress = lz4_compress_crypto, - .coa_decompress = lz4_decompress_crypto } } + .coa_decompress = lz4_decompress_crypto, + .coa_zbufsize = lz4_zbufsize_crypto } } }; static struct scomp_alg scomp = {
@@ -135,6 +154,7 @@ static struct scomp_alg scomp = { .free_ctx = lz4_free_ctx, .compress = lz4_scompress, .decompress = lz4_sdecompress, + .zbufsize = lz4_szbufsize, .base = { .cra_name = "lz4", .cra_driver_name = "lz4-scomp",
--
2.17.1