Module Name: src
Committed By: christos
Date: Wed Feb 12 01:51:52 UTC 2020
Modified Files:
src/external/bsd/ppp/dist/pppd: eap.c
Log Message:
pppd: Fix bounds check in EAP code
Given that we have just checked vallen < len, it can never be the case
that vallen >= len + sizeof(rhostname). This fixes the check so we
actually avoid overflowing the rhostname array.
Reported-by: Ilja Van Sprundel <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
From:
https://github.com/paulusmack/ppp/commit/8d7970b8f3db727fe798b65f3377fe6787575426
To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.5 src/external/bsd/ppp/dist/pppd/eap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/external/bsd/ppp/dist/pppd/eap.c
diff -u src/external/bsd/ppp/dist/pppd/eap.c:1.4 src/external/bsd/ppp/dist/pppd/eap.c:1.5
--- src/external/bsd/ppp/dist/pppd/eap.c:1.4 Sat Oct 25 17:11:37 2014
+++ src/external/bsd/ppp/dist/pppd/eap.c Tue Feb 11 20:51:52 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: eap.c,v 1.4 2014/10/25 21:11:37 christos Exp $ */
+/* $NetBSD: eap.c,v 1.5 2020/02/12 01:51:52 christos Exp $ */
/*
* eap.c - Extensible Authentication Protocol for PPP (RFC 2284)
*
@@ -49,7 +49,7 @@
#define RCSID "Id: eap.c,v 1.4 2004/11/09 22:39:25 paulus Exp "
static const char rcsid[] = RCSID;
#else
-__RCSID("$NetBSD: eap.c,v 1.4 2014/10/25 21:11:37 christos Exp $");
+__RCSID("$NetBSD: eap.c,v 1.5 2020/02/12 01:51:52 christos Exp $");
#endif
/*
@@ -1433,7 +1433,7 @@ int len;
}
/* Not so likely to happen. */
- if (vallen >= len + sizeof (rhostname)) {
+ if (len - vallen >= sizeof (rhostname)) {
dbglog("EAP: trimming really long peer name down");
BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1);
rhostname[sizeof (rhostname) - 1] = '\0';
@@ -1859,7 +1859,7 @@ int len;
}
/* Not so likely to happen. */
- if (vallen >= len + sizeof (rhostname)) {
+ if (len - vallen >= sizeof (rhostname)) {
dbglog("EAP: trimming really long peer name down");
BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1);
rhostname[sizeof (rhostname) - 1] = '\0';
