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SendAlert: clear output buffer to try and send the alert now

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This commit is contained in:
Juliusz Sosinowicz
2022-06-01 16:48:57 +02:00
parent df10e1fad2
commit d29c656d4f
1 changed files with 18 additions and 1 deletions
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19
src/internal.c
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@@ -20640,8 +20640,25 @@ int SendAlert(WOLFSSL* ssl, int severity, int type)
/* check for available size */ /* check for available size */
outputSz = ALERT_SIZE + MAX_MSG_EXTRA + dtlsExtra; outputSz = ALERT_SIZE + MAX_MSG_EXTRA + dtlsExtra;
if ((ret = CheckAvailableSize(ssl, outputSz)) != 0) if ((ret = CheckAvailableSize(ssl, outputSz)) != 0) {
#ifdef WOLFSSL_DTLS
/* If CheckAvailableSize returned WANT_WRITE due to a blocking write
* then discard pending output and just send the alert. */
if (ssl->options.dtls) {
if (ret != WANT_WRITE || severity != alert_fatal)
return ret; return ret;
ShrinkOutputBuffer(ssl);
if ((ret = CheckAvailableSize(ssl, outputSz)) != 0) {
return ret;
}
}
else {
return ret;
}
#else
return ret;
#endif
}
/* Check output buffer */ /* Check output buffer */
if (ssl->buffers.outputBuffer.buffer == NULL) if (ssl->buffers.outputBuffer.buffer == NULL)