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Avoid null pointer dereference if error result lacks SQLSTATE.

Although error results received from the backend should always havea SQLSTATE field, ones generated by libpq won't, making this codevulnerable to a crash after, say, untimely loss of connection.Noted by Coverity.Oversight in commit403a3d9. Back-patch to 9.5, as that was.

1 parent41a033b commit7d72fd9Copy full SHA for 7d72fd9

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1 file changed

-6

lines changed

src/bin/pg_dump
- pg_backup_db.c

1 file changed

-6

lines changed

`‎src/bin/pg_dump/pg_backup_db.c`

Lines changed: 8 additions & 6 deletions

Original file line number	Diff line number	Diff line change
`@@ -543,9 +543,9 @@ bool`
`543`	`543`	`IsLockTableGeneric(Archive*AHX)`
`544`	`544`	`{`
`545`	`545`	`ArchiveHandleAH= (ArchiveHandle)AHX;`
`546`		`-PGresult*res;`
`547`		`-char*sqlstate;`
`548`		`-boolretval;`
	`546`	`+PGresult*res;`
	`547`	`+char*sqlstate;`
	`548`	`+boolretval;`
`549`	`549`
`550`	`550`	`if (AHX->remoteVersion >=140000)`
`551`	`551`	`return true;`
`@@ -572,13 +572,15 @@ IsLockTableGeneric(Archive *AHX)`
`572`	`572`	`break;`
`573`	`573`	`casePGRES_FATAL_ERROR:`
`574`	`574`	`sqlstate=PQresultErrorField(res,PG_DIAG_SQLSTATE);`
`575`		`-if (strcmp(sqlstate,ERRCODE_WRONG_OBJECT_TYPE)==0)`
	`575`	`+if (sqlstate&&`
	`576`	`+strcmp(sqlstate,ERRCODE_WRONG_OBJECT_TYPE)==0)`
`576`	`577`	`{`
`577`	`578`	`retval= false;`
`578`	`579`	`break;`
`579`	`580`	`}`
`580`		`-elseif (strcmp(sqlstate,ERRCODE_LOCK_NOT_AVAILABLE)==0\|\|`
`581`		`-strcmp(sqlstate,ERRCODE_INSUFFICIENT_PRIVILEGE)==0)`
	`581`	`+elseif (sqlstate&&`
	`582`	`+ (strcmp(sqlstate,ERRCODE_LOCK_NOT_AVAILABLE)==0\|\|`
	`583`	`+strcmp(sqlstate,ERRCODE_INSUFFICIENT_PRIVILEGE)==0))`
`582`	`584`	`{`
`583`	`585`	`retval= true;`
`584`	`586`	`break;`

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Commit7d72fd9

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1 file changed

1 file changed

`‎src/bin/pg_dump/pg_backup_db.c`

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