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commit    c3db8a2e2ea4498d87060a1f5101c12055a4b174
Author:   Michael Paquier <michael@paquier.xyz>
Date:     Sat May 28 03:12:58 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 | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 1ffa1780cbe..ef0f7812603 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -8322,7 +8322,16 @@ 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);
@@ -8334,7 +8343,8 @@ 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);


[parent: a44bc8b8f421]