22 lines
802 B
Diff
22 lines
802 B
Diff
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commit 9d294de90d1cc66956389856e60b6944b27b4817
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Author: Frank Morgner <frankmorgner@gmail.com>
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Date: Thu Jun 4 10:04:10 2020 +0200
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prevent out of bounds write
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fixes https://oss-fuzz.com/testcase-detail/5226571123392512
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diff --git a/src/libopensc/card-tcos.c b/src/libopensc/card-tcos.c
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index 673c2493..e88c80bd 100644
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--- a/src/libopensc/card-tcos.c
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+++ b/src/libopensc/card-tcos.c
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@@ -623,6 +623,8 @@ static int tcos_decipher(sc_card_t *card, const u8 * crgram, size_t crgram_len,
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apdu.data = sbuf;
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apdu.lc = apdu.datalen = crgram_len+1;
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sbuf[0] = tcos3 ? 0x00 : ((data->pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) ? 0x81 : 0x02);
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+ if (sizeof sbuf - 1 < crgram_len)
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+ return SC_ERROR_INVALID_ARGUMENTS;
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memcpy(sbuf+1, crgram, crgram_len);
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r = sc_transmit_apdu(card, &apdu);
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