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-rw-r--r--crypto/rsa/rsa_pmeth.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/crypto/rsa/rsa_pmeth.c b/crypto/rsa/rsa_pmeth.c
index d61d6e8b66ac..6a7c67cdb86c 100644
--- a/crypto/rsa/rsa_pmeth.c
+++ b/crypto/rsa/rsa_pmeth.c
@@ -228,8 +228,14 @@ static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
return ret;
ret = sltmp;
} else if (rctx->pad_mode == RSA_X931_PADDING) {
- if (!setup_tbuf(rctx, ctx))
+ if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
+ RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
+ return -1;
+ }
+ if (!setup_tbuf(rctx, ctx)) {
+ RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
return -1;
+ }
memcpy(rctx->tbuf, tbs, tbslen);
rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,