From: David Rowley Date: Tue, 6 Jan 2026 04:29:12 +0000 (+1300) Subject: Fix issue with EVENT TRIGGERS and ALTER PUBLICATION X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ca8506ea59e396b0efa43edf439d4d3c77d8311;p=thirdparty%2Fpostgresql.git Fix issue with EVENT TRIGGERS and ALTER PUBLICATION When processing the "publish" options of an ALTER PUBLICATION command, we call SplitIdentifierString() to split the options into a List of strings. Since SplitIdentifierString() modifies the delimiter character and puts NULs in their place, this would overwrite the memory of the AlterPublicationStmt. Later in AlterPublicationOptions(), the modified AlterPublicationStmt is copied for event triggers, which would result in the event trigger only seeing the first "publish" option rather than all options that were specified in the command. To fix this, make a copy of the string before passing to SplitIdentifierString(). Here we also adjust a similar case in the pgoutput plugin. There's no known issues caused by SplitIdentifierString() here, so this is being done out of paranoia. Thanks to Henson Choi for putting together an example case showing the ALTER PUBLICATION issue. Author: sunil s Reviewed-by: Henson Choi Reviewed-by: zengman Backpatch-through: 14 --- diff --git a/src/backend/commands/publicationcmds.c b/src/backend/commands/publicationcmds.c index 479ae8f96db..fc3a4c19e65 100644 --- a/src/backend/commands/publicationcmds.c +++ b/src/backend/commands/publicationcmds.c @@ -121,7 +121,12 @@ parse_publication_options(ParseState *pstate, pubactions->pubtruncate = false; *publish_given = true; - publish = defGetString(defel); + + /* + * SplitIdentifierString destructively modifies its input, so make + * a copy so we don't modify the memory of the executing statement + */ + publish = pstrdup(defGetString(defel)); if (!SplitIdentifierString(publish, ',', &publish_list)) ereport(ERROR, diff --git a/src/backend/replication/pgoutput/pgoutput.c b/src/backend/replication/pgoutput/pgoutput.c index 458418a249d..9ee8949e040 100644 --- a/src/backend/replication/pgoutput/pgoutput.c +++ b/src/backend/replication/pgoutput/pgoutput.c @@ -346,7 +346,11 @@ parse_output_parameters(List *options, PGOutputData *data) errmsg("conflicting or redundant options"))); publication_names_given = true; - if (!SplitIdentifierString(strVal(defel->arg), ',', + /* + * Pass a copy of the DefElem->arg since SplitIdentifierString + * modifies its input. + */ + if (!SplitIdentifierString(pstrdup(strVal(defel->arg)), ',', &data->publication_names)) ereport(ERROR, (errcode(ERRCODE_INVALID_NAME),