From 25c26a3b7a9ad8192ccc923e15cf62bf0108ef94 Mon Sep 17 00:00:00 2001
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From: werew <werew@ret2libc.com>
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Date: Thu, 3 Oct 2019 19:57:10 +0200
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Subject: [PATCH] Fixes #507
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Fix a vulnerability in der_decode_utf8_string as specified here:
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https://github.com/libtom/libtomcrypt/issues/507
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[for import into Buildroot]
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Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
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---
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src/pk/asn1/der/utf8/der_decode_utf8_string.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/pk/asn1/der/utf8/der_decode_utf8_string.c b/src/pk/asn1/der/utf8/der_decode_utf8_string.c
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index 94555b99f..d3ed82bea 100644
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--- a/src/pk/asn1/der/utf8/der_decode_utf8_string.c
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+++ b/src/pk/asn1/der/utf8/der_decode_utf8_string.c
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@@ -65,7 +65,7 @@ int der_decode_utf8_string(const unsigned char *in, unsigned long inlen,
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/* count number of bytes */
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for (z = 0; (tmp & 0x80) && (z <= 4); z++, tmp = (tmp << 1) & 0xFF);
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- if (z > 4 || (x + (z - 1) > inlen)) {
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+ if (z == 1 || z > 4 || (x + (z - 1) > inlen)) {
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return CRYPT_INVALID_PACKET;
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}
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