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Fill buf[] with known data and check the vsnprintf() doesn't write beyond the specified buffer length. Would have picked up the bug in field padding. Signed-off-by: David Laight <david.laight.linux@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch.msgid.link/20260302101815.3043-7-david.laight.linux@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>