From 7d0b6bc3f49070a10d6257628bbdf93e52d87fed Mon Sep 17 00:00:00 2001
From: Josh Ferrell <josh@vector35.com>
Date: Mon, 14 Oct 2024 16:45:26 -0400
Subject: Fix DWARF import crash when FDE has row with start==end

---
 rust/examples/dwarf/dwarf_import/src/lib.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'rust/examples')

diff --git a/rust/examples/dwarf/dwarf_import/src/lib.rs b/rust/examples/dwarf/dwarf_import/src/lib.rs
index 076586f1..58e66dda 100644
--- a/rust/examples/dwarf/dwarf_import/src/lib.rs
+++ b/rust/examples/dwarf/dwarf_import/src/lib.rs
@@ -358,10 +358,15 @@ where <U as UnwindSection<R>>::Offset: std::hash::Hash {
                         match row.cfa() {
                             CfaRule::RegisterAndOffset {register: _, offset} => {
                                 // TODO: we should store offsets by register
-                                cfa_offsets.insert(
-                                    row.start_address()..row.end_address(),
-                                    *offset,
-                                );
+                                if row.start_address() < row.end_address() {
+                                    cfa_offsets.insert(
+                                        row.start_address()..row.end_address(),
+                                        *offset,
+                                    );
+                                }
+                                else {
+                                    debug!("Invalid FDE table row addresses: {:#x}..{:#x}", row.start_address(), row.end_address());
+                                }
                             },
                             CfaRule::Expression(_) => {
                                 debug!("Unhandled CFA expression when determining offset");
-- 
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