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prevent out of bounds read 

fixes https://oss-fuzz.com/testcase-detail/5769298181357568
This commit is contained in:
Frank Morgner 2020-06-05 08:31:19 +02:00
parent 9d294de90d
commit 0f0e0b2e30
1 changed files with 2 additions and 0 deletions
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2
src/libopensc/card-tcos.c
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@ -559,6 +559,8 @@ static int tcos_compute_signature(sc_card_t *card, const u8 * data, size_t datal
int keylen= tcos3 ? 256 : 128;
sc_format_apdu(card, &apdu, keylen>255 ? SC_APDU_CASE_4_EXT : SC_APDU_CASE_4_SHORT, 0x2A,0x80,0x86);
for(i=0; i<sizeof(sbuf);++i) sbuf[i]=0xff;
if (keylen < datalen)
return SC_ERROR_INVALID_ARGUMENTS;
sbuf[0]=0x02; sbuf[1]=0x00; sbuf[2]=0x01; sbuf[keylen-datalen]=0x00;
memcpy(sbuf+keylen-datalen+1, data, datalen);
dlen=keylen+1;