On Fri, Nov 5, 2021 at 7:11 PM osumi.takamichi@fujitsu.com
<osumi.takamichi@fujitsu.com> wrote:
>
I did a quick scan through the latest v8 patch and noticed the following things:
src/backend/postmaster/pgstat.c
(1) pgstat_recv_subworker_twophase_xact()
The copying from msg->m_gid to key.gid does not seem to be correct.
strlen() is being called on a junk value, since key.gid has not been
assigned yet.
It should be changed as follows:
BEFORE:
+ strlcpy(key.gid, msg->m_gid, strlen(key.gid));
AFTER:
+ strlcpy(key.gid, msg->m_gid, sizeof(key.gid));
(2) pgstat_get_subworker_prepared_txn()
Similar to above, strlen() usage is not correct, and should use
strlcpy() instead of memcpy().
BEFORE:
+ memcpy(key.gid, gid, strlen(key.gid));
AFTER:
+ strlcpy(key.gid, gid, sizeof(key.gid));
(3) stats_reset
Note that the "stats_reset" column has been removed from the
pg_stat_subscription_workers view in the underlying latest v20 patch.
Regards,
Greg Nancarrow
Fujitsu Australia