[newlib-cygwin] strace: Handle ofile descriptor more carefully.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=fe244117709854cd60d6c7974c595659516a713c

commit fe244117709854cd60d6c7974c595659516a713c
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Aug 3 12:02:17 2015 +0200

    strace: Handle ofile descriptor more carefully.
    
    	Fix coverity CIDs 128250 - 128252
    
            * strace.cc (main2): Don't call setvbuf on NULL descriptor.
            Explicitely fclose ofile.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/utils/ChangeLog |  5 +++++
 winsup/utils/strace.cc | 14 ++++++++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/winsup/utils/ChangeLog b/winsup/utils/ChangeLog
index 21a7c49..e317ae3 100644
--- a/winsup/utils/ChangeLog
+++ b/winsup/utils/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-03  Corinna Vinschen  <corinna@vinschen.de>
+
+	* strace.cc (main2): Don't call setvbuf on NULL descriptor.
+	Explicitely fclose ofile.
+
 2015-07-29  Corinna Vinschen  <corinna@vinschen.de>
 
 	* strace.cc (main2): Rename from main.
diff --git a/winsup/utils/strace.cc b/winsup/utils/strace.cc
index 4c0c04f..f9c6644 100644
--- a/winsup/utils/strace.cc
+++ b/winsup/utils/strace.cc
@@ -1034,6 +1034,7 @@ main2 (int argc, char **argv)
   int opt;
   int toggle = 0;
   int sawquiet = -1;
+  DWORD ret = 0;
 
   if (load_cygwin ())
     {
@@ -1147,23 +1148,24 @@ character #%d.\n", optarg, (int) (endptr - optarg), endptr);
   if (!mask)
     mask = _STRACE_ALL;
 
-  if (bufsize)
-    setvbuf (ofile, (char *) alloca (bufsize), _IOFBF, bufsize);
-
   if (!ofile)
     ofile = stdout;
 
+  if (bufsize)
+    setvbuf (ofile, (char *) alloca (bufsize), _IOFBF, bufsize);
+
   if (toggle)
     dotoggle (pid);
   else
     {
       drive_map = (void *) cygwin_internal (CW_ALLOC_DRIVE_MAP);
-      DWORD ret = dostrace (mask, ofile, pid, argv + optind);
+      ret = dostrace (mask, ofile, pid, argv + optind);
       if (drive_map)
 	cygwin_internal (CW_FREE_DRIVE_MAP, drive_map);
-      ExitProcess (ret);
     }
-  return 0;
+  if (ofile && ofile != stdout)
+    fclose (ofile);
+  ExitProcess (ret);
 }
 
 int