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/arm/backtrace.c b/sysdeps/arm/backtrace.c
index 7ab487c2fc..5a30c209ff 100644
--- a/sysdeps/arm/backtrace.c
+++ b/sysdeps/arm/backtrace.c
@@ -92,6 +92,10 @@ __backtrace (array, size)
      int size;
 {
   struct trace_arg arg = { .array = array, .size = size, .cnt = -1 };
+
+  if (size <= 0)
+    return 0;
+
 #ifdef SHARED
   __libc_once_define (static, once);
 
@@ -100,8 +104,7 @@ __backtrace (array, size)
     return 0;
 #endif
 
-  if (size >= 1)
-    unwind_backtrace (backtrace_helper, &arg);
+  unwind_backtrace (backtrace_helper, &arg);
 
   if (arg.cnt > 1 && arg.array[arg.cnt - 1] == NULL)
     --arg.cnt;