void-packages/srcpkgs/unzip/patches/patch-zipinfo.c.patch

28 lines
1.1 KiB
Diff

$NetBSD: patch-zipinfo.c,v 1.1 2017/02/04 23:25:59 wiz Exp $
Fix crash in zipinfo, CVE-2016-9844.
http://www.openwall.com/lists/oss-security/2016/12/05/19
--- zipinfo.c.orig 2009-02-08 17:04:30.000000000 +0000
+++ zipinfo.c
@@ -1921,7 +1921,18 @@ static int zi_short(__G) /* return PK-
ush dnum=(ush)((G.crec.general_purpose_bit_flag>>1) & 3);
methbuf[3] = dtype[dnum];
} else if (methnum >= NUM_METHODS) { /* unknown */
- sprintf(&methbuf[1], "%03u", G.crec.compression_method);
+ /* 2016-12-05 SMS.
+ * https://launchpad.net/bugs/1643750
+ * Unexpectedly large compression methods overflow
+ * &methbuf[]. Use the old, three-digit decimal format
+ * for values which fit. Otherwise, sacrifice the "u",
+ * and use four-digit hexadecimal.
+ */
+ if (G.crec.compression_method <= 999) {
+ sprintf( &methbuf[ 1], "%03u", G.crec.compression_method);
+ } else {
+ sprintf( &methbuf[ 0], "%04X", G.crec.compression_method);
+ }
}
for (k = 0; k < 15; ++k)