From 9d294de90d1cc66956389856e60b6944b27b4817 Mon Sep 17 00:00:00 2001 From: Frank Morgner Date: Thu, 4 Jun 2020 10:04:10 +0200 Subject: [PATCH] prevent out of bounds write fixes https://oss-fuzz.com/testcase-detail/5226571123392512 --- src/libopensc/card-tcos.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/libopensc/card-tcos.c b/src/libopensc/card-tcos.c index 673c2493dd..e88c80bd79 100644 --- a/src/libopensc/card-tcos.c +++ b/src/libopensc/card-tcos.c @@ -623,6 +623,8 @@ static int tcos_decipher(sc_card_t *card, const u8 * crgram, size_t crgram_len, apdu.data = sbuf; apdu.lc = apdu.datalen = crgram_len+1; sbuf[0] = tcos3 ? 0x00 : ((data->pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) ? 0x81 : 0x02); + if (sizeof sbuf - 1 < crgram_len) + return SC_ERROR_INVALID_ARGUMENTS; memcpy(sbuf+1, crgram, crgram_len); r = sc_transmit_apdu(card, &apdu);