Commit 44068d59 authored by Stephan Mueller's avatar Stephan Mueller Committed by Herbert Xu
Browse files

crypto: DRBG - initialize SGL only once

An SGL to be initialized only once even when its buffers are written
to several times.
Signed-off-by: default avatarStephan Mueller <>
Signed-off-by: default avatarHerbert Xu <>
parent 0d8da104
......@@ -1749,17 +1749,16 @@ static int drbg_kcapi_sym_ctr(struct drbg_state *drbg,
u8 *inbuf, u32 inlen,
u8 *outbuf, u32 outlen)
struct scatterlist sg_in;
struct scatterlist sg_in, sg_out;
int ret;
sg_init_one(&sg_in, inbuf, inlen);
sg_init_one(&sg_out, drbg->outscratchpad, DRBG_OUTSCRATCHLEN);
while (outlen) {
u32 cryptlen = min3(inlen, outlen, (u32)DRBG_OUTSCRATCHLEN);
struct scatterlist sg_out;
/* Output buffer may not be valid for SGL, use scratchpad */
sg_init_one(&sg_out, drbg->outscratchpad, cryptlen);
skcipher_request_set_crypt(drbg->ctr_req, &sg_in, &sg_out,
cryptlen, drbg->V);
ret = crypto_skcipher_encrypt(drbg->ctr_req);
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