Eric Pouech : dbghelp: Correctly handle the RULE_EXPRESSION when computing CFA in dwarf debug info .

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1c037bf5641d6dab556439882c1dc26d11a96b68
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=1c037bf5641d6dab556439882c1dc26d11a96b68

Author: Eric Pouech <eric.pouech at orange.fr>
Date:   Sun Jun 27 18:55:15 2010 +0200

dbghelp: Correctly handle the RULE_EXPRESSION when computing CFA in dwarf debug info.

---

 dlls/dbghelp/dwarf.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/dlls/dbghelp/dwarf.c b/dlls/dbghelp/dwarf.c
index 274410e..413ae44 100644
--- a/dlls/dbghelp/dwarf.c
+++ b/dlls/dbghelp/dwarf.c
@@ -2877,7 +2877,12 @@ static void apply_frame_info(struct module* module, struct cpu_stack_walk* csw,
     switch (info->cfa_rule)
     {
     case RULE_EXPRESSION:
-        *cfa = *(ULONG_PTR*)eval_expression(module, csw, (const unsigned char*)info->cfa_offset, context);
+        *cfa = eval_expression(module, csw, (const unsigned char*)info->cfa_offset, context);
+        if (!sw_read_mem(csw, *cfa, cfa, sizeof(*cfa)))
+        {
+            WARN("Couldn't read memory at %p\n", (void*)*cfa);
+            return;
+        }
         break;
     case RULE_VAL_EXPRESSION:
         *cfa = eval_expression(module, csw, (const unsigned char*)info->cfa_offset, context);