From e9e81b8063b095b02cf104bb992fa9bf9515b9d8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tim=20R=C3=BChsen?= <tim.ruehsen@gmx.de> Date: Fri, 1 Sep 2017 10:04:48 +0200 Subject: [PATCH] lib/punycode.c (decode_digit): Fix integer overflow This fix is a backport from libidn2 and addresses CVE-2017-14062. Signed-off-by: Baruch Siach <baruch@tkos.co.il> --- Upstream status: commit e9e81b8063b095 lib/punycode.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/lib/punycode.c b/lib/punycode.c index 86819a7deb85..49250a13e2cc 100644 --- a/lib/punycode.c +++ b/lib/punycode.c @@ -88,10 +88,10 @@ enum /* point (for use in representing integers) in the range 0 to */ /* base-1, or base if cp does not represent a value. */ -static punycode_uint -decode_digit (punycode_uint cp) +static unsigned +decode_digit (int cp) { - return cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 : + return (unsigned) cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 : cp - 97 < 26 ? cp - 97 : base; } -- 2.14.1
