Try to fix issue avast#637

Reference: avast#637
seviezhou · Sep 9, 2019 · c517d07 · c517d07
1 parent 63f03e7
commit c517d07
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/bin2llvmir/optimizations/decoder/ir_modifications.cpp b/src/bin2llvmir/optimizations/decoder/ir_modifications.cpp
@@ -423,6 +423,9 @@ bool Decoder::canSplitFunctionOn(
 				continue;
 			}
 			auto up = fncStarts.upper_bound(bAddr);
+			if (up == fncStarts.begin()) {
+				return false;
+			}	
 			--up;
 			Address bFnc = *up;
 
@@ -442,6 +445,9 @@ bool Decoder::canSplitFunctionOn(
 					continue;
 				}
 				auto up = fncStarts.upper_bound(pAddr);
+				if (up == fncStarts.begin()) {
+					return false;
+				}
 				--up;
 				Address pFnc = *up;