[RFA 1/6] Change reopen_exec_file to check result of stat

Tom Tromey tom@tromey.com
Mon Jun 6 21:34:00 GMT 2016


This seems to be a real bug found by -Wunused-but-set-variable.  If
"stat" fails for some reason, gdb would use the uninitialized "st".

2016-06-06  Tom Tromey  <tom@tromey.com>

	* corefile.c (reopen_exec_file): Only examine st.st_mtime if stat
	succeeded.
---
 gdb/ChangeLog  | 5 +++++
 gdb/corefile.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index af4ddcc..649bb0b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2016-06-06  Tom Tromey  <tom@tromey.com>
+
+	* corefile.c (reopen_exec_file): Only examine st.st_mtime if stat
+	succeeded.
+
 2016-06-02  Jon Turney  <jon.turney@dronecode.org.uk>
 
 	* windows-nat.c (handle_output_debug_string): Return type of
diff --git a/gdb/corefile.c b/gdb/corefile.c
index 6cc2afc..64de931 100644
--- a/gdb/corefile.c
+++ b/gdb/corefile.c
@@ -144,7 +144,7 @@ reopen_exec_file (void)
   cleanups = make_cleanup (xfree, filename);
   res = stat (filename, &st);
 
-  if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
+  if (res == 0 && exec_bfd_mtime && exec_bfd_mtime != st.st_mtime)
     exec_file_attach (filename, 0);
   else
     /* If we accessed the file since last opening it, close it now;
-- 
2.5.5



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