[PATCH 4/9] crypto, lzo: Implement zbufsize()
From: Kees Cook <hidden>
Date: 2018-08-02 21:51:31
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 lzo, based on the logic originally used by pstore. Signed-off-by: Kees Cook <redacted> --- crypto/lzo.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/crypto/lzo.c b/crypto/lzo.c
index 218567d717d6..ea18f62c5247 100644
--- a/crypto/lzo.c
+++ b/crypto/lzo.c@@ -120,6 +120,24 @@ static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src, return __lzo_decompress(src, slen, dst, dlen); } +static int __lzo_zbufsize(unsigned int slen, unsigned int *dlen) +{ + *dlen = lzo1x_worst_compress(slen); + return 0; +} + +static int lzo_zbufsize(struct crypto_tfm *tfm, unsigned int slen, + unsigned int *dlen) +{ + return __lzo_zbufsize(slen, dlen); +} + +static int lzo_szbufsize(struct crypto_scomp *tfm, unsigned int slen, + unsigned int *dlen, void *ctx) +{ + return __lzo_zbufsize(slen, dlen); +} + static struct crypto_alg alg = { .cra_name = "lzo", .cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@@ -129,7 +147,8 @@ static struct crypto_alg alg = { .cra_exit = lzo_exit, .cra_u = { .compress = { .coa_compress = lzo_compress, - .coa_decompress = lzo_decompress } } + .coa_decompress = lzo_decompress, + .coa_zbufsize = lzo_zbufsize } } }; static struct scomp_alg scomp = {
@@ -137,6 +156,7 @@ static struct scomp_alg scomp = { .free_ctx = lzo_free_ctx, .compress = lzo_scompress, .decompress = lzo_sdecompress, + .zbufsize = lzo_szbufsize, .base = { .cra_name = "lzo", .cra_driver_name = "lzo-scomp",
--
2.17.1