From 57fc84fef35b7f44b989e2a7049052a7c01d74e2 Mon Sep 17 00:00:00 2001
From: Ralph Lange <Ralph.Lange@bessy.de>
Date: Fri, 27 Apr 2012 13:25:18 -0400
Subject: [PATCH] dbState: Avoid segfaults when called with NULL pointer

---
 src/ioc/db/dbState.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ioc/db/dbState.c b/src/ioc/db/dbState.c
index 11ce519d6..f7d577038 100644
--- a/src/ioc/db/dbState.c
+++ b/src/ioc/db/dbState.c
@@ -60,6 +60,8 @@ dbStateId dbStateCreate(const char *name)
 
 void dbStateSet(dbStateId id)
 {
+    if (!id)
+        return;
     epicsMutexMustLock(id->lock);
     id->status = 1;
     epicsMutexUnlock(id->lock);
@@ -67,6 +69,8 @@ void dbStateSet(dbStateId id)
 
 void dbStateClear(dbStateId id)
 {
+    if (!id)
+        return;
     epicsMutexMustLock(id->lock);
     id->status = 0;
     epicsMutexUnlock(id->lock);
@@ -76,6 +80,8 @@ int dbStateGet(dbStateId id)
 {
     int status;
 
+    if (!id)
+        return 0;
     epicsMutexMustLock(id->lock);
     status = id->status;
     epicsMutexUnlock(id->lock);