From 90e7cdff3aa66779486914f88333f6601f0c1cf4 Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Tue, 26 May 2015 00:02:57 +0100 Subject: [PATCH] Fix error check in GOST engine The return value of i2d functions can be negative if an error occurs. Therefore don't assign the return value to an unsigned type and *then* check if it is negative. RT#3862 Reviewed-by: Richard Levitte --- engines/ccgost/gost94_keyx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/engines/ccgost/gost94_keyx.c b/engines/ccgost/gost94_keyx.c index db7d4023aa..b529c8ee81 100644 --- a/engines/ccgost/gost94_keyx.c +++ b/engines/ccgost/gost94_keyx.c @@ -105,6 +105,7 @@ int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx); gost_ctx cctx; int key_is_ephemeral = 1; + int tmp_outlen; EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx); /* Do not use vizir cipher parameters with cryptopro */ @@ -175,12 +176,13 @@ int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, } ASN1_OBJECT_free(gkt->key_agreement_info->cipher); gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid); - *outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL); - if (*outlen <= 0) { + tmp_outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL); + if (tmp_outlen <= 0) { GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO); goto err; } + *outlen = tmp_outlen; if (!key_is_ephemeral) { /* Set control "public key from client certificate used" */ if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=