diff --git a/src/processor/basic_source_line_resolver.cc b/src/processor/basic_source_line_resolver.cc
index 8db41b4b..a66a4700 100644
--- a/src/processor/basic_source_line_resolver.cc
+++ b/src/processor/basic_source_line_resolver.cc
@@ -226,7 +226,7 @@ bool BasicSourceLineResolver::Module::LoadMap(const string &map_file) {
   // lines, which might be present for FUNC lines of highly-templatized
   // code.
   char buffer[8192];
-  Function *cur_func = NULL;
+  linked_ptr<Function> cur_func;
 
   while (fgets(buffer, sizeof(buffer), f)) {
     if (strncmp(buffer, "FILE ", 5) == 0) {
@@ -236,17 +236,17 @@ bool BasicSourceLineResolver::Module::LoadMap(const string &map_file) {
         return false;
       }
     } else if (strncmp(buffer, "FUNC ", 5) == 0) {
-      cur_func = ParseFunction(buffer);
-      if (!cur_func) {
-        return false;
-      }
-      if (!functions_.StoreRange(cur_func->address, cur_func->size,
-                                 linked_ptr<Function>(cur_func))) {
+      cur_func.reset(ParseFunction(buffer));
+      if (!cur_func.get()) {
         return false;
       }
+      // StoreRange will fail if the function has an invalid address or size.
+      // We'll silently ignore this, the function and any corresponding lines
+      // will be destroyed when cur_func is released.
+      functions_.StoreRange(cur_func->address, cur_func->size, cur_func);
     } else if (strncmp(buffer, "PUBLIC ", 7) == 0) {
       // Clear cur_func: public symbols don't contain line number information.
-      cur_func = NULL;
+      cur_func.reset();
 
       if (!ParsePublicSymbol(buffer)) {
         return false;
@@ -259,7 +259,7 @@ bool BasicSourceLineResolver::Module::LoadMap(const string &map_file) {
       //
       // MODULE <guid> <age> <filename>
     } else {
-      if (!cur_func) {
+      if (!cur_func.get()) {
         return false;
       }
       Line *line = ParseLine(buffer);
diff --git a/src/processor/basic_source_line_resolver_unittest.cc b/src/processor/basic_source_line_resolver_unittest.cc
index 96ce5ebe..63b38456 100644
--- a/src/processor/basic_source_line_resolver_unittest.cc
+++ b/src/processor/basic_source_line_resolver_unittest.cc
@@ -152,6 +152,10 @@ static bool RunTests() {
   ASSERT_FALSE(frame_info->allocates_base_pointer);
   ASSERT_FALSE(frame_info->program_string.empty());
 
+  frame.instruction = 0x2000;
+  frame_info.reset(resolver.FillSourceLineInfo(&frame));
+  ASSERT_FALSE(frame_info.get());
+
   TestCodeModule module2("module2");
 
   frame.instruction = 0x2181;
@@ -186,8 +190,11 @@ static bool RunTests() {
                                    testdata_dir + "/module3_bad.out"));
   ASSERT_FALSE(resolver.HasModule("module3"));
   ASSERT_FALSE(resolver.LoadModule("module4",
-                                   testdata_dir + "/invalid-filename"));
+                                   testdata_dir + "/module4_bad.out"));
   ASSERT_FALSE(resolver.HasModule("module4"));
+  ASSERT_FALSE(resolver.LoadModule("module5",
+                                   testdata_dir + "/invalid-filename"));
+  ASSERT_FALSE(resolver.HasModule("module5"));
   ASSERT_FALSE(resolver.HasModule("invalid-module"));
   return true;
 }
diff --git a/src/processor/testdata/module1.out b/src/processor/testdata/module1.out
index 63de4cfa..85687828 100644
--- a/src/processor/testdata/module1.out
+++ b/src/processor/testdata/module1.out
@@ -11,6 +11,8 @@ FUNC 1100 8 4 Function1_2
 1104 4 66 2
 FUNC 1200 100 8 Function1_3
 FUNC 1300 100 c Function1_4
+FUNC 2000 0 0 Test_Zero_Size_Function_Is_Ignored
+2000 4 88 2
 STACK WIN 4 1000 c 1 0 0 0 0 0 1 $eip 4 + ^ = $esp $ebp 8 + = $ebp $ebp ^ =
 STACK WIN 4 1100 8 1 0 0 0 0 0 1 $eip 4 + ^ = $esp $ebp 8 + = $ebp $ebp ^ =
 STACK WIN 4 1100 100 1 0 0 0 0 0 1 $eip 4 + ^ = $esp $ebp 8 + = $ebp $ebp ^ =
diff --git a/src/processor/testdata/module4_bad.out b/src/processor/testdata/module4_bad.out
new file mode 100644
index 00000000..d01fb2cc
--- /dev/null
+++ b/src/processor/testdata/module4_bad.out
@@ -0,0 +1,5 @@
+MODULE windows x86 444444444444444444444444444444444 module4.pdb
+FILE 1 file4_1.cc
+FILE 2 file4_2.cc
+1000 4 44 1
+1004 4 45 1