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Added checks for possible NULL value and out-of-bounds reads.

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This commit is contained in:
Markus Makela
2015-08-16 22:30:04 +03:00
parent 86ad570af8
commit 458598141b
1 changed files with 11 additions and 5 deletions
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16
server/modules/protocol/mysql_backend.c
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@ -1633,11 +1633,17 @@ static GWBUF* process_response_data (
{
uint8_t* data;
/** Read next packet length */
data = GWBUF_DATA(readbuf);
nbytes_left = MYSQL_GET_PACKET_LEN(data)+MYSQL_HEADER_LEN;
/** Store new status to protocol structure */
protocol_set_response_status(p, npackets_left, nbytes_left);
/** Read next packet length if there is at least
* three bytes left. If there is less than three
* bytes in the buffer or it is NULL, we need to
wait for more data from the backend server.*/
if(readbuf == NULL || GWBUF_LENGTH(readbuf) < 3)
break;
data = GWBUF_DATA(readbuf);
nbytes_left = MYSQL_GET_PACKET_LEN(data)+MYSQL_HEADER_LEN;
/** Store new status to protocol structure */
protocol_set_response_status(p, npackets_left, nbytes_left);
}
}
}