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commit    fd2efda5d6f16a0476b41fe14de954549236f76a
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Wed Apr 11 20:39:48 2018 +0000
First released in: 11.0, 9.3.23, 9.4.18, 9.5.13, 9.6.9, 10.4

    Make local copy of client hostnames in backend status array.
    
    The other strings, application_name and query string, were snapshotted to
    local memory in pgstat_read_current_status(), but we forgot to do that for
    client hostnames. As a result, the client hostname would appear to change in
    the local copy, if the client disconnected.
    
    Backpatch to all supported versions.
    
    Author: Edmund Horner
    Reviewed-by: Michael Paquier
    Discussion: https://www.postgresql.org/message-id/CAMyN-kA7aOJzBmrYFdXcc7Z0NmW%2B5jBaf_m%3D_-77uRNyKC9r%3DA%40mail.gmail.com


 src/backend/postmaster/pgstat.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index 64616a24139..3ec23d76ddc 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -2985,6 +2985,7 @@ pgstat_read_current_status(void)
 	LocalPgBackendStatus *localtable;
 	LocalPgBackendStatus *localentry;
 	char	   *localappname,
+			   *localclienthostname,
 			   *localactivity;
 #ifdef USE_SSL
 	PgBackendSSLStatus *localsslstatus;
@@ -3003,6 +3004,9 @@ pgstat_read_current_status(void)
 	localappname = (char *)
 		MemoryContextAlloc(pgStatLocalContext,
 						   NAMEDATALEN * MaxBackends);
+	localclienthostname = (char *)
+		MemoryContextAlloc(pgStatLocalContext,
+						   NAMEDATALEN * MaxBackends);
 	localactivity = (char *)
 		MemoryContextAlloc(pgStatLocalContext,
 						   pgstat_track_activity_query_size * MaxBackends);
@@ -3043,6 +3047,8 @@ pgstat_read_current_status(void)
 				 */
 				strcpy(localappname, (char *) beentry->st_appname);
 				localentry->backendStatus.st_appname = localappname;
+				strcpy(localclienthostname, (char *) beentry->st_clienthostname);
+				localentry->backendStatus.st_clienthostname = localclienthostname;
 				strcpy(localactivity, (char *) beentry->st_activity);
 				localentry->backendStatus.st_activity = localactivity;
 				localentry->backendStatus.st_ssl = beentry->st_ssl;
@@ -3074,6 +3080,7 @@ pgstat_read_current_status(void)
 
 			localentry++;
 			localappname += NAMEDATALEN;
+			localclienthostname += NAMEDATALEN;
 			localactivity += pgstat_track_activity_query_size;
 #ifdef USE_SSL
 			localsslstatus++;


[parent: 2224d1ce1447]