From b30518eedbce705f9f34970ff459083d738d2e36 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Thu, 18 Aug 2022 08:49:55 +0200 Subject: libio: Convert __vswprintf_internal to buffers (bug 27857) Always null-terminate the buffer and set E2BIG if the buffer is too small. This fixes bug 27857. --- stdio-common/wprintf_buffer_flush.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'stdio-common/wprintf_buffer_flush.c') diff --git a/stdio-common/wprintf_buffer_flush.c b/stdio-common/wprintf_buffer_flush.c index 2d91095cca..46af0f348f 100644 --- a/stdio-common/wprintf_buffer_flush.c +++ b/stdio-common/wprintf_buffer_flush.c @@ -16,6 +16,7 @@ License along with the GNU C Library; if not, see . */ +#include #include #include "printf_buffer-wchar_t.h" @@ -31,6 +32,11 @@ __wprintf_buffer_do_flush (struct __wprintf_buffer *buf) case __wprintf_buffer_mode_to_file: __wprintf_buffer_flush_to_file ((struct __wprintf_buffer_to_file *) buf); return; + case __wprintf_buffer_mode_swprintf: + buf->write_end[-1] = L'\0'; + __set_errno (E2BIG); + __wprintf_buffer_mark_failed (buf); + return; } __builtin_trap (); } -- cgit v1.2.3