Index: src/vdbeaux.c
==================================================================
--- src/vdbeaux.c
+++ src/vdbeaux.c
@@ -3816,10 +3816,17 @@
     pMem->z = 0;
     d += sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
     pMem++;
     if( (++u)>=p->nField ) break;
   }
+  if( d>nKey && u ){
+    assert( CORRUPT_DB );
+    /* In a corrupt record entry, the last pMem might have been set up using 
+    ** uninitialized memory. Overwrite its value with NULL, to prevent
+    ** warnings from MSAN. */
+    sqlite3VdbeMemSetNull(pMem-1);
+  }
   assert( u<=pKeyInfo->nKeyField + 1 );
   p->nField = u;
 }
 
 #ifdef SQLITE_DEBUG