From bcde12940007e836f7b831f1cdfda8dc2bda0c58 Mon Sep 17 00:00:00 2001
From: Jeff Johnston <jjohnstn@redhat.com>
Date: Fri, 24 Apr 2009 22:52:52 +0000
Subject: 2009-04-24  Jeff johnston  <jjohnstn@redhat.com>

        * libc/stdio/fgetc.c: Make sure sfp lock is acquired before the
        file lock and released before the file lock to avoid a deadlock
        scenario.
        * libc/stdio/fgets.c: Ditto.
        * libc/stdio/fgetwc.c: Ditto.
        * libc/stdio/fgetws.c: Ditto.
        * libc/stdio/fread.c: Ditto.
        * libc/stdio/fseek.c: Ditto.
        * libc/stdio/getc.c: Ditto.
        * libc/stdio/getdelim.c: Ditto.
        * libc/stdio/gets.c: Ditto.
---
 newlib/libc/stdio/fseek.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'newlib/libc/stdio/fseek.c')

diff --git a/newlib/libc/stdio/fseek.c b/newlib/libc/stdio/fseek.c
index 4d5fda4fe..526ae4ccb 100644
--- a/newlib/libc/stdio/fseek.c
+++ b/newlib/libc/stdio/fseek.c
@@ -138,6 +138,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
 
   CHECK_INIT (ptr, fp);
 
+  __sfp_lock_acquire ();
   _flockfile (fp);
 
   /* If we've been doing some writing, and we're in append mode
@@ -155,6 +156,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
     {
       ptr->_errno = ESPIPE;	/* ??? */
       _funlockfile (fp);
+      __sfp_lock_release ();
       return EOF;
     }
 
@@ -180,6 +182,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
 	  if (curoff == -1L)
 	    {
 	      _funlockfile (fp);
+	      __sfp_lock_release ();
 	      return EOF;
 	    }
 	}
@@ -205,6 +208,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
     default:
       ptr->_errno = EINVAL;
       _funlockfile (fp);
+      __sfp_lock_release ();
       return (EOF);
     }
 
@@ -263,6 +267,8 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
   if ((long)target != target)
     {
       ptr->_errno = EOVERFLOW;
+      _funlockfile (fp);
+      __sfp_lock_release ();
       return EOF;
     }
 
@@ -319,6 +325,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
       fp->_flags &= ~__SEOF;
       memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
       _funlockfile (fp);
+      __sfp_lock_release ();
       return 0;
     }
 
@@ -349,6 +356,7 @@ _DEFUN(_fseek_r, (ptr, fp, offset, whence),
     }
   memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
   _funlockfile (fp);
+  __sfp_lock_release ();
   return 0;
 
   /*
@@ -361,6 +369,7 @@ dumb:
       || seekfn (ptr, fp->_cookie, offset, whence) == POS_ERR)
     {
       _funlockfile (fp);
+      __sfp_lock_release ();
       return EOF;
     }
   /* success: clear EOF indicator and discard ungetc() data */
@@ -379,6 +388,7 @@ dumb:
   fp->_flags &= ~__SNPT;
   memset (&fp->_mbstate, 0, sizeof (_mbstate_t));
   _funlockfile (fp);
+  __sfp_lock_release ();
   return 0;
 }
 
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