Unbounded access to fxStr nsf. Bug reported by Toki Barron, fix contributed

by Aidan Van Dyk <aidan@highrise.ca>.

diff --git a/faxd/NSF.c++ b/faxd/NSF.c++
index afefc5f0e4295a1432f8a9f12cd3fffb1d16a276..f4f54c4ca4d969a8d627e530fbd591d13abdbb7c 100644 (file)
--- a/faxd/NSF.c++
+++ b/faxd/NSF.c++
@@ -144,6 +144,8 @@ void NSF::loadRawData( const u_char* rawData, int size, const u_char* revTab )
 
 void NSF::decode()
 {
+    if ( nsf.length() == 0 )
+       return;
     for( const NSFData* p = KnownNSF; p->vendorId; p++ ){
         if( !memcmp( p->vendorId, &nsf[0], p->vendorIdSize ) ){
             if (p->vendorName != 0) {