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winansi: avoid buffer overrun

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When we could not convert the UTF-8 sequence into Unicode for writing to
the Console, we should not try to write an insanely-long sequence of
invalid wide characters (mistaking the negative return value for an
unsigned length).

Reported by Coverity.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2017-05-04 15:55:34 +02:00 committed by Junio C Hamano
parent 3057da5ad5
commit b6b066adf9
1 changed files with 5 additions and 0 deletions
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5
compat/winansi.c
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@ -140,6 +140,11 @@ static void write_console(unsigned char *str, size_t len)
/* convert utf-8 to utf-16 */
int wlen = xutftowcsn(wbuf, (char*) str, ARRAY_SIZE(wbuf), len);
if (wlen < 0) {
wchar_t *err = L"[invalid]";
WriteConsoleW(console, err, wcslen(err), &dummy, NULL);
return;
}
/* write directly to console */
WriteConsoleW(console, wbuf, wlen, &dummy, NULL);