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dtls: better sanitize incoming messages in stateless handling

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This commit is contained in:
Juliusz Sosinowicz
2025-01-30 18:02:34 +01:00
parent e4b7a53191
commit 3cd64581eb
1 changed files with 3 additions and 2 deletions
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5
src/dtls.c
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@@ -365,7 +365,8 @@ static int FindExtByType(WolfSSL_ConstVector* ret, word16 extType,
ato16(exts.elements + idx, &type); ato16(exts.elements + idx, &type);
idx += OPAQUE16_LEN; idx += OPAQUE16_LEN;
idx += ReadVector16(exts.elements + idx, &ext); idx += ReadVector16(exts.elements + idx, &ext);
if (idx > exts.size) if (idx > exts.size ||
ext.elements + ext.size > exts.elements + exts.size)
return BUFFER_ERROR; return BUFFER_ERROR;
if (type == extType) { if (type == extType) {
XMEMCPY(ret, &ext, sizeof(ext)); XMEMCPY(ret, &ext, sizeof(ext));
@@ -498,7 +499,7 @@ static int TlsCheckSupportedVersion(const WOLFSSL* ssl,
ch->extension, &tlsxFound); ch->extension, &tlsxFound);
if (ret != 0) if (ret != 0)
return ret; return ret;
if (!tlsxFound) { if (!tlsxFound || tlsxSupportedVersions.elements == NULL) {
*isTls13 = 0; *isTls13 = 0;
return 0; return 0;
} }