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commit    ae236bf660f54dd8bedc94d601fb3e38b8ab2341
Author:   Michael Paquier <michael@paquier.xyz>
Date:     Sat May 28 03:12:55 2022 +0000
First released in: 15.0, 10.22, 11.17, 12.12, 13.8, 14.4

    Handle NULL for short descriptions of custom GUC variables
    
    If a short description is specified as NULL in one of the various
    DefineCustomXXXVariable() functions available to external modules to
    define a custom parameter, SHOW ALL would crash.  This change teaches
    SHOW ALL to properly handle NULL short descriptions, as well as any code
    paths that manipulate it, to gain in flexibility.  Note that
    help_config.c was already able to do that, when describing a set of GUCs
    for postgres --describe-config.
    
    Author: Steve Chavez
    Reviewed by: Nathan Bossart, Andres Freund, Michael Paquier, Tom Lane
    Discussion: https://postgr.es/m/CAGRrpzY6hO-Kmykna_XvsTv8P2DshGiU6G3j8yGao4mk0CqjHA%40mail.gmail.com
    Backpatch-through: 10


 src/backend/utils/misc/guc.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 086b666cc13..608794bbda7 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -8858,7 +8858,16 @@ ShowAllGUCConfig(DestReceiver *dest)
 			isnull[1] = true;
 		}
 
-		values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));
+		if (conf->short_desc)
+		{
+			values[2] = PointerGetDatum(cstring_to_text(conf->short_desc));
+			isnull[2] = false;
+		}
+		else
+		{
+			values[2] = PointerGetDatum(NULL);
+			isnull[2] = true;
+		}
 
 		/* send it to dest */
 		do_tup_output(tstate, values, isnull);
@@ -8870,7 +8879,8 @@ ShowAllGUCConfig(DestReceiver *dest)
 			pfree(setting);
 			pfree(DatumGetPointer(values[1]));
 		}
-		pfree(DatumGetPointer(values[2]));
+		if (conf->short_desc)
+			pfree(DatumGetPointer(values[2]));
 	}
 
 	end_tup_output(tstate);
@@ -9048,7 +9058,7 @@ GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
 	values[3] = _(config_group_names[conf->group]);
 
 	/* short_desc */
-	values[4] = _(conf->short_desc);
+	values[4] = conf->short_desc != NULL ? _(conf->short_desc) : NULL;
 
 	/* extra_desc */
 	values[5] = conf->long_desc != NULL ? _(conf->long_desc) : NULL;


[parent: 01ab9fb7dee5]