MonetDB: Jan2014 - Avoid NULL dereference

[Martin Kersten]

Changeset: 113bc21582b0 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=113bc21582b0
Modified Files:
        sql/backends/monet5/sql.c
Branch: Jan2014
Log Message:

Avoid NULL dereference


diffs (20 lines):

diff --git a/sql/backends/monet5/sql.c b/sql/backends/monet5/sql.c
--- a/sql/backends/monet5/sql.c
+++ b/sql/backends/monet5/sql.c
@@ -1942,9 +1942,13 @@ DELTAbat(bat *result, bat *col, bat *uid
        }
 
        c = BATdescriptor(*col);
-       if ((res = BATcopy(c, TYPE_void, c->ttype, TRUE)) == NULL)
-               throw(MAL, "sql.delta", OPERATION_FAILED);
-       BBPunfix(c->batCacheid);
+       if ( c ) {
+               if ((res = BATcopy(c, TYPE_void, c->ttype, TRUE)) == NULL){
+                       BBPunfix(c->batCacheid);
+                       throw(MAL, "sql.delta", OPERATION_FAILED);
+               }
+               BBPunfix(c->batCacheid);
+       }
 
        if ((u_val = BATdescriptor(*uval)) == NULL)
                throw(MAL, "sql.delta", RUNTIME_OBJECT_MISSING);
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