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Fix to bug #463, http://bugs.skysql.com/show_bug.cgi?id=463

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mysql_common.c:gw_MySQL_get_next_packet didn't handle case where an insert command followed by alter table in the same read buffer. It shouldn't been possible without multi-statement being set.
This commit is contained in:
VilhoRaatikka
2014-08-14 22:33:57 +03:00
parent 2393ac57e9
commit 902004c1ee
4 changed files with 24 additions and 35 deletions
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52
server/modules/protocol/mysql_common.c
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@ -1514,6 +1514,9 @@ GWBUF* gw_MySQL_get_next_packet(
size_t packetlen;
size_t totalbuflen;
uint8_t* data;
size_t nbytes_copied = 0;
uint8_t* target;
readbuf = *p_readbuf;
if (readbuf == NULL)
@ -1540,44 +1543,27 @@ GWBUF* gw_MySQL_get_next_packet(
packetbuf = NULL;
goto return_packetbuf;
}
/** there is one complete packet in the buffer */
if (packetlen == buflen)
{
packetbuf = gwbuf_clone_portion(readbuf, 0, packetlen);
*p_readbuf = gwbuf_consume(readbuf, packetlen);
goto return_packetbuf;
}
packetbuf = gwbuf_alloc(packetlen);
target = GWBUF_DATA(packetbuf);
packetbuf->gwbuf_type = readbuf->gwbuf_type; /*< Copy the type too */
/**
* Packet spans multiple buffers.
* Allocate buffer for complete packet
* copy packet parts into it and consume copied bytes
*/
else if (packetlen > buflen)
* Copy first MySQL packet to packetbuf and leave posible other
* packets to read buffer.
*/
while (nbytes_copied < packetlen && totalbuflen > 0)
{
size_t nbytes_copied = 0;
uint8_t* target;
uint8_t* src = GWBUF_DATA((*p_readbuf));
size_t bytestocopy;
packetbuf = gwbuf_alloc(packetlen);
target = GWBUF_DATA(packetbuf);
packetbuf->gwbuf_type = readbuf->gwbuf_type; /*< Copy the type too */
bytestocopy = MIN(buflen,packetlen-nbytes_copied);
while (nbytes_copied < packetlen)
{
uint8_t* src = GWBUF_DATA(readbuf);
size_t buflen = GWBUF_LENGTH(readbuf);
memcpy(target+nbytes_copied, src, buflen);
readbuf = gwbuf_consume(readbuf, buflen);
nbytes_copied += buflen;
}
*p_readbuf = readbuf;
ss_dassert(nbytes_copied == packetlen);
}
else
{
packetbuf = gwbuf_clone_portion(readbuf, 0, packetlen);
*p_readbuf = gwbuf_consume(readbuf, packetlen);
memcpy(target+nbytes_copied, src, bytestocopy);
*p_readbuf = gwbuf_consume((*p_readbuf), bytestocopy);
totalbuflen = gwbuf_length((*p_readbuf));
nbytes_copied += bytestocopy;
}
ss_dassert(buflen == 0 || nbytes_copied == packetlen);
return_packetbuf:
return packetbuf;