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mqtt: deal with 0 byte reads correctly

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OSS-Fuzz found it
Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28676

Closes #6327
This commit is contained in:
Daniel Stenberg 2020-12-15 08:51:33 +01:00
parent c4d88f89a9
commit a259eee99f
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GPG key ID: 5CC908FDB71E12C2
1 changed files with 2 additions and 2 deletions
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4
lib/mqtt.c
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@ -553,7 +553,7 @@ static CURLcode mqtt_doing(struct connectdata *conn, bool *done)
case MQTT_FIRST:
/* Read the initial byte only */
result = Curl_read(conn, sockfd, (char *)&mq->firstbyte, 1, &nread);
if(result)
if(!nread)
break;
Curl_debug(data, CURLINFO_HEADER_IN, (char *)&mq->firstbyte, 1);
/* remember the first byte */
@ -563,7 +563,7 @@ static CURLcode mqtt_doing(struct connectdata *conn, bool *done)
case MQTT_REMAINING_LENGTH:
do {
result = Curl_read(conn, sockfd, (char *)&byte, 1, &nread);
if(result)
if(!nread)
break;
Curl_debug(data, CURLINFO_HEADER_IN, (char *)&byte, 1);
pkt[mq->npacket++] = byte;