lrzsz: fix CVE-2018-10195

"Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak
information to receiver."

Take a patch from Fedora to resolve CVE-2018-10195.

(From OE-Core rev: a7b50fcee9a295de57f743fa3637905992da722e)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/lrzsz/lrzsz-0.12.20/cve-2018-10195.patch

@@ -0,0 +1,28 @@
+Integer overflow in src/zm.c:zsdata() causes crash in sz and can leak information to receiver.
+
+Patch taken from Fedora.
+
+CVE: CVE-2018-10195
+Upstream-Status: Inappropriate (dead upstream)
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+diff -urN lrzsz-0.12.20/src/zm.c lrzsz-0.12.20.new/src/zm.c
+--- lrzsz-0.12.20/src/zm.c	Tue Dec 29 09:48:38 1998
++++ lrzsz-0.12.20.new/src/zm.c	Tue Oct  8 12:46:58 2002
+@@ -431,10 +431,12 @@
+ 	VPRINTF(3,("zsdata: %lu %s", (unsigned long) length, 
+ 		Zendnames[(frameend-ZCRCE)&3]));
+ 	crc = 0;
+-	do {
+-		zsendline(*buf); crc = updcrc((0377 & *buf), crc);
+-		buf++;
+-	} while (--length>0);
++
++	for( ; length; length--) {
++	  zsendline(*buf); crc = updcrc((0377 & *buf), crc);
++	  buf++;
++	}
++
+ 	xsendline(ZDLE); xsendline(frameend);
+ 	crc = updcrc(frameend, crc);
+ 

meta/recipes-bsp/lrzsz/lrzsz_0.12.20.bb

@@ -19,6 +19,7 @@ SRC_URI = "http://www.ohse.de/uwe/releases/lrzsz-${PV}.tar.gz \
 	   file://acdefine.patch \
 	   file://lrzsz_fix_for_automake-1.12.patch \
            file://lrzsz-check-locale.h.patch \
+           file://cve-2018-10195.patch \
            "
 
 SRC_URI[md5sum] = "b5ce6a74abc9b9eb2af94dffdfd372a4"