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msc: check the length of input

This commit is contained in:
Frank Morgner 2015-09-17 20:06:19 +02:00
parent 547494f012
commit de58f51012
1 changed files with 3 additions and 1 deletions
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4
src/libopensc/muscle.c
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@ -601,7 +601,9 @@ int msc_extract_rsa_public_key(sc_card_t *card,
if(buffer[0] != MSC_RSA_PUBLIC) SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_NORMAL, SC_ERROR_UNKNOWN_DATA_RECEIVED);
*modLength = (buffer[3] << 8) | buffer[4];
/* Read the modulus and the exponent length */
if (*modLength + 2 > sizeof buffer)
SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_NORMAL, SC_ERROR_OUT_OF_MEMORY);
r = msc_read_object(card, inputId, fileLocation, buffer, *modLength + 2);
fileLocation += *modLength + 2;
if(r < 0) SC_FUNC_RETURN(card->ctx, SC_LOG_DEBUG_NORMAL, r);