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-rw-r--r--libio/iovsprintf.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libio/iovsprintf.c b/libio/iovsprintf.c
index f0c9889724..a4fc949333 100644
--- a/libio/iovsprintf.c
+++ b/libio/iovsprintf.c
@@ -43,8 +43,11 @@ _IO_vsprintf (string, format, args)
_IO_init ((_IO_FILE *) &sf, 0);
_IO_JUMPS ((_IO_FILE *) &sf) = &_IO_str_jumps;
_IO_str_init_static ((_IO_FILE *) &sf, string, -1, string);
+ _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, &sf);
+ _IO_flockfile (&sf);
ret = _IO_vfprintf ((_IO_FILE *) &sf, format, args);
_IO_putc_unlocked ('\0', (_IO_FILE *) &sf);
+ _IO_cleanup_region_end (1);
return ret;
}