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libtls: Check for CHANGE_CIPHER_SPEC type only if upper layer returns NEED_MORE

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A type is returned only if upper layers successfully created a record, that is
returns NEED_MORE. If we do not check for the return value, we might check a
previous record or the uninitialized type variable and falsely reset the
sequence number.
This commit is contained in:
Martin Willi
2015-01-12 14:18:24 +01:00
parent aa71c19e5c
commit 780bf2b8e9
1 changed files with 5 additions and 6 deletions
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src/libtls/tls_protection.c
+5 -6
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@@ -101,14 +101,13 @@ METHOD(tls_protection_t, build, status_t,
status_t status;
status = this->compression->build(this->compression, type, data);
if (*type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_out = 0;
return status;
}
if (status == NEED_MORE)
{
if (*type == TLS_CHANGE_CIPHER_SPEC)
{
this->seq_out = 0;
return status;
}
if (this->aead_out)
{
if (!this->aead_out->encrypt(this->aead_out, this->version,