38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
|
From 8d7970b8f3db727fe798b65f3377fe6787575426 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Paul Mackerras <paulus@ozlabs.org>
|
||
|
|
Date: Mon, 3 Feb 2020 15:53:28 +1100
|
||
|
|
Subject: [PATCH] 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 <ivansprundel@ioactive.com>
|
||
|
|
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
|
||
|
|
---
|
||
|
|
pppd/eap.c | 4 ++--
|
||
|
|
1 file changed, 2 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/pppd/eap.c b/pppd/eap.c
|
||
|
|
index 94407f56..1b93db01 100644
|
||
|
|
--- a/pppd/eap.c
|
||
|
|
+++ b/pppd/eap.c
|
||
|
|
@@ -1420,7 +1420,7 @@ 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';
|
||
|
|
@@ -1846,7 +1846,7 @@ 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';
|