From cde2e050ec4f2f1b7db38429aa4e9c0f4656308c Mon Sep 17 00:00:00 2001 From: Peter Popovec Date: Wed, 26 Apr 2023 13:22:09 +0200 Subject: [PATCH] NULL pointer fix Thanks to the clang analyzer: Null pointer passed to 2nd parameter expecting 'nonnull' [clang-analyzer-core.NonNullParamChecker] modified: src/libopensc/card-myeid.c --- src/libopensc/card-myeid.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/src/libopensc/card-myeid.c b/src/libopensc/card-myeid.c index 31dd209f3e..951c179f1b 100644 --- a/src/libopensc/card-myeid.c +++ b/src/libopensc/card-myeid.c @@ -1973,6 +1973,9 @@ myeid_enc_dec_sym(struct sc_card *card, const u8 *data, size_t datalen, return_len = block_size - pad_byte; } *outlen = return_len; + /* application can request buffer size or actual buffer size is too small */ + if (out == NULL) + LOG_FUNC_RETURN(ctx, SC_SUCCESS); if (return_len > *outlen) LOG_FUNC_RETURN(ctx, SC_ERROR_BUFFER_TOO_SMALL); memcpy(out, priv->sym_plain_buffer, return_len); @@ -2042,10 +2045,11 @@ myeid_enc_dec_sym(struct sc_card *card, const u8 *data, size_t datalen, priv->sym_crypt_buffer_len = 0; rest_len = 0; } - memcpy(sdata, data, apdu_datalen); - data += apdu_datalen; - datalen -= apdu_datalen; - + if (data) { + memcpy(sdata, data, apdu_datalen); + data += apdu_datalen; + datalen -= apdu_datalen; + } r = sc_transmit_apdu(card, &apdu); LOG_TEST_RET(ctx, r, "APDU transmit failed"); r = sc_check_sw(card, apdu.sw1, apdu.sw2); @@ -2084,7 +2088,8 @@ myeid_enc_dec_sym(struct sc_card *card, const u8 *data, size_t datalen, /* save rest of data for next run */ priv->sym_crypt_buffer_len = datalen; sc_log(ctx, "rest data len = %zu", datalen); - memcpy(priv->sym_crypt_buffer, data, datalen); + if (data) + memcpy(priv->sym_crypt_buffer, data, datalen); sc_log(ctx, "return data len = %zu", return_len); *outlen = return_len; return SC_SUCCESS;