Henri Verbeet : ntdll: Properly handle 0 returns from unw_step().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d82f06c07556408e9584d2a1f8b275df39c93d74
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=d82f06c07556408e9584d2a1f8b275df39c93d74

Author: Henri Verbeet <hverbeet at codeweavers.com>
Date:   Fri Oct 18 19:17:45 2019 +0330

ntdll: Properly handle 0 returns from unw_step().

Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ntdll/signal_arm64.c  | 6 +++++-
 dlls/ntdll/signal_x86_64.c | 7 ++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index 43e5969229..d6d5f15c87 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -523,7 +523,11 @@ static NTSTATUS libunwind_virtual_unwind( ULONG_PTR ip, ULONG_PTR *frame, CONTEX
            ip, (unsigned long)info.start_ip, (unsigned long)info.end_ip, (unsigned long)info.handler,
            (unsigned long)info.lsda, (unsigned long)info.unwind_info );
 
-    rc = unw_step( &cursor );
+    if (!(rc = unw_step( &cursor )))
+    {
+        WARN( "last frame\n" );
+        return STATUS_SUCCESS;
+    }
     if (rc < 0)
     {
         WARN( "failed to unwind: %d\n", rc );
diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index 6508654e77..9645c5266c 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -1524,7 +1524,12 @@ static NTSTATUS libunwind_virtual_unwind( ULONG64 ip, BOOL* got_info, ULONG64 *f
            ip, (unsigned long)info.start_ip, (unsigned long)info.end_ip, (unsigned long)info.handler,
            (unsigned long)info.lsda, (unsigned long)info.unwind_info );
 
-    rc = unw_step(&cursor);
+    if (!(rc = unw_step( &cursor )))
+    {
+        WARN( "last frame\n" );
+        *got_info = FALSE;
+        return STATUS_SUCCESS;
+    }
     if (rc < 0)
     {
         WARN( "failed to unwind: %d\n", rc );