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Date: Sun, 11 Mar 2018 22:12:04 +0100
From: Salvatore Mesoraca <s.mesoraca16@...il.com>
To: linux-kernel@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com,
netdev@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
David Rientjes <rientjes@...gle.com>,
Elena Reshetova <elena.reshetova@...el.com>,
Hans Liljestrand <ishkamiel@...il.com>,
Kees Cook <keescook@...omium.org>,
Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: [PATCH] net: llc: drop VLA in llc_sap_mcast()
Avoid a VLA[1] by using a real constant expression instead of a variable.
The compiler should be able to optimize the original code and avoid using
an actual VLA. Anyway this change is useful because it will avoid a false
positive with -Wvla, it might also help the compiler generating better
code.
[1] https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Salvatore Mesoraca <s.mesoraca16@...il.com>
---
net/llc/llc_sap.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index d90928f..a7f7b8f 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -394,8 +394,9 @@ static void llc_sap_mcast(struct llc_sap *sap,
const struct llc_addr *laddr,
struct sk_buff *skb)
{
- int i = 0, count = 256 / sizeof(struct sock *);
- struct sock *sk, *stack[count];
+ int i = 0;
+ struct sock *sk;
+ struct sock *stack[256 / sizeof(struct sock *)];
struct llc_sock *llc;
struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex);
@@ -408,7 +409,7 @@ static void llc_sap_mcast(struct llc_sap *sap,
continue;
sock_hold(sk);
- if (i < count)
+ if (i < ARRAY_SIZE(stack))
stack[i++] = sk;
else {
llc_do_mcast(sap, skb, stack, i);
--
1.9.1
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