Fix BZ #18084 -- backtrace (..., 0) dumps core on x86.

Other architectures also had bugs, or did unnecessary work.

1 files changed, 5 insertions, 2 deletions

diff --git a/sysdeps/s390/s390-64/backtrace.c b/sysdeps/s390/s390-64/backtrace.c
index 08e563e0df..184a73741b 100644
--- a/sysdeps/s390/s390-64/backtrace.c
+++ b/sysdeps/s390/s390-64/backtrace.c
@@ -125,6 +125,10 @@ int
 __backtrace (void **array, int size)
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -134,8 +138,7 @@ __backtrace (void **array, int size)
     return __backchain_backtrace (array, size);
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   return arg.cnt != -1 ? arg.cnt : 0;
 }