From 7494efbb16abb1e9df5291fb1b05ded5517baba4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophile=20Bastian?= <contact@tobast.fr>
Date: Wed, 13 Jun 2018 19:09:10 +0200
Subject: [PATCH] eh_elf: detect eh_elf errors
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(No data, unimplemented data type, …)
---
 src/eh_elf/eh_elf.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/eh_elf/eh_elf.c b/src/eh_elf/eh_elf.c
index 95f3ce3e..380ee11f 100644
--- a/src/eh_elf/eh_elf.c
+++ b/src/eh_elf/eh_elf.c
@@ -114,6 +114,14 @@ int eh_elf_step_cursor(struct cursor *cursor) {
             ip - mmap_entry->offset,
             fetchw_here);
 
+    if(eh_elf_context.rbp + 1 == 0
+            && eh_elf_context.rsp + 1 == 0
+            && eh_elf_context.rip + 1 == 0) {
+        // Error, somehow
+        Debug(2, "eh_elf unwinding FAILED\n");
+        return -3;
+    }
+
     // Push back the data into libunwind's structures
     for (int i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
         cursor->dwarf.loc[i] = DWARF_NULL_LOC;