linux-kernel - [PATCH v2] net: ipv6: xfrm6

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Message-Id: <1520667645-21975-1-git-send-email-andreaschristofo@gmail.com>
Date:   Sat, 10 Mar 2018 09:40:44 +0200
From:   Andreas Christoforou <andreaschristofo@...il.com>
To:     keescook@...omium.org
Cc:     kernel-hardening@...ts.openwall.com,
        Andreas Christoforou <andreaschristofo@...il.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] net: ipv6: xfrm6_state: remove VLA usage

The kernel would like to have all stack VLA usage removed[1].
Instead of dynamic allocation, just use XFRM_MAX_DEPTH
as already done for the "class" array, but as per feedback,
I will not drop maxclass because that changes the behavior.
In one case, it'll do this loop up to 5, the other
caller up to 6.

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Andreas Christoforou <andreaschristofo@...il.com>
---
v2:
- use XFRM_MAX_DEPTH for "count" array (Steffen and Mathias).
---
 net/ipv6/xfrm6_state.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/xfrm6_state.c b/net/ipv6/xfrm6_state.c
index b15075a..270a53a 100644
--- a/net/ipv6/xfrm6_state.c
+++ b/net/ipv6/xfrm6_state.c
@@ -62,7 +62,7 @@ __xfrm6_sort(void **dst, void **src, int n, int (*cmp)(void *p), int maxclass)
 {
 	int i;
 	int class[XFRM_MAX_DEPTH];
-	int count[maxclass];
+	int count[XFRM_MAX_DEPTH];
 
 	memset(count, 0, sizeof(count));
 
-- 
2.7.4