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diff --git a/ChangeLog b/ChangeLog
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--- a/ChangeLog
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+2019-12-18  Paul Eggert  <eggert@Penguin.CS.UCLA.EDU>
+
+	Fix memcpy issue found by -fsanitize=undefined
+	* field.c (set_record): Don't memcpy (databuf, NULL, 0),
+	as the C standard says the resulting behavior is undefined.
+
 2019-12-16         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* awkgram.y, command.y: Upgrade to Bison 3.5.