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Protect against NULL-dereference in pg_dump

findTableByOid() is allowed to return NULL and we should therefore bechecking for that case. getOwnedSeqs() and dumpSequence() shouldn'tever actually see this happen, but given odd circumstances it might andcommitf9e439b probably shouldn't have removed that check.Pointed out by Coverity. Initial patch from Michael Paquier.Back-patch to 9.6, where that commit had removed the check.

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src/bin/pg_dump
- pg_dump.c

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`‎src/bin/pg_dump/pg_dump.c`

Lines changed: 8 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -6089,6 +6089,9 @@ getOwnedSeqs(Archive *fout, TableInfo tblinfo[], int numTables)`
`6089`	`6089`	`continue;/* not an owned sequence */`
`6090`	`6090`
`6091`	`6091`	`owning_tab = findTableByOid(seqinfo->owning_tab);`
	`6092`	`+if (owning_tab == NULL)`
	`6093`	`+exit_horribly(NULL, "failed sanity check, parent table OID %u of sequence OID %u not found\n",`
	`6094`	`+ seqinfo->owning_tab, seqinfo->dobj.catId.oid);`
`6092`	`6095`
`6093`	`6096`	`/*`
`6094`	`6097`	`* We need to dump the components that are being dumped for the table`
`@@ -16537,7 +16540,11 @@ dumpSequence(Archive fout, TableInfo tbinfo)`
`16537`	`16540`	`{`
`16538`	`16541`	`TableInfo *owning_tab = findTableByOid(tbinfo->owning_tab);`
`16539`	`16542`
`16540`		`-if (owning_tab && owning_tab->dobj.dump & DUMP_COMPONENT_DEFINITION)`
	`16543`	`+if (owning_tab == NULL)`
	`16544`	`+exit_horribly(NULL, "failed sanity check, parent table OID %u of sequence OID %u not found\n",`
	`16545`	`+ tbinfo->owning_tab, tbinfo->dobj.catId.oid);`
	`16546`	`+`
	`16547`	`+if (owning_tab->dobj.dump & DUMP_COMPONENT_DEFINITION)`
`16541`	`16548`	`{`
`16542`	`16549`	`resetPQExpBuffer(query);`
`16543`	`16550`	`appendPQExpBuffer(query, "ALTER SEQUENCE %s",`

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Commit8b1bf31

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`‎src/bin/pg_dump/pg_dump.c`

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