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Fix NULL dereference when ENCODER does not implement IMPORT_OBJECT 

External ENCODER may not implement OSSL_FUNC_ENCODER_IMPORT_OBJECT,
so a check for NULL is needed.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14919)
This commit is contained in:
Petr Gotthard 2021-04-18 18:28:25 +02:00 committed by Tomas Mraz
parent bfe2fcc840
commit 021521aa91
1 changed files with 7 additions and 3 deletions
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10
crypto/encode_decode/encoder_pkey.c
View File

@ -76,6 +76,7 @@ struct collected_encoder_st {
const char *output_structure;
const char *output_type;
const OSSL_PROVIDER *keymgmt_prov;
OSSL_ENCODER_CTX *ctx;
int error_occurred;
@ -102,7 +103,9 @@ static void collect_encoder(OSSL_ENCODER *encoder, void *arg)
if (!OSSL_ENCODER_is_a(encoder, name)
|| (encoder->does_selection != NULL
&& !encoder->does_selection(provctx, data->ctx->selection)))
&& !encoder->does_selection(provctx, data->ctx->selection))
|| (data->keymgmt_prov != prov
&& encoder->import_object == NULL))
continue;
/* Only add each encoder implementation once */
@ -213,6 +216,7 @@ static int ossl_encoder_ctx_setup_for_pkey(OSSL_ENCODER_CTX *ctx,
const char *propquery)
{
struct construct_data_st *data = NULL;
const OSSL_PROVIDER *prov = NULL;
OSSL_LIB_CTX *libctx = NULL;
int ok = 0;
@ -222,8 +226,7 @@ static int ossl_encoder_ctx_setup_for_pkey(OSSL_ENCODER_CTX *ctx,
}
if (evp_pkey_is_provided(pkey)) {
const OSSL_PROVIDER *prov = EVP_KEYMGMT_provider(pkey->keymgmt);
prov = EVP_KEYMGMT_provider(pkey->keymgmt);
libctx = ossl_provider_libctx(prov);
}
@ -252,6 +255,7 @@ static int ossl_encoder_ctx_setup_for_pkey(OSSL_ENCODER_CTX *ctx,
encoder_data.output_type = ctx->output_type;
encoder_data.output_structure = ctx->output_structure;
encoder_data.error_occurred = 0;
encoder_data.keymgmt_prov = prov;
encoder_data.ctx = ctx;
OSSL_ENCODER_do_all_provided(libctx, collect_encoder, &encoder_data);
sk_OPENSSL_CSTRING_free(keymgmt_data.names);