[NET]: net/core/filter.c: make len cover the entire packet

As suggested by Herbert Xu:

Since we don't require anything to be in the linear packet range
anymore make len cover the entire packet.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/filter.c b/net/core/filter.c
index 3923428..cd91a24 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -76,10 +76,6 @@ static inline void *load_pointer(struct sk_buff *skb, int k,
  
 int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen)
 {
-       /* len is UNSIGNED. Byte wide insns relies only on implicit
-          type casts to prevent reading arbitrary memory locations.
-        */
-       unsigned int len = skb->len-skb->data_len;
        struct sock_filter *fentry;     /* We walk down these */
        void *ptr;
        u32 A = 0;                      /* Accumulator */
@@ -206,10 +202,10 @@ load_b:
                        }
                        return 0;
                case BPF_LD|BPF_W|BPF_LEN:
-                       A = len;
+                       A = skb->len;
                        continue;
                case BPF_LDX|BPF_W|BPF_LEN:
-                       X = len;
+                       X = skb->len;
                        continue;
                case BPF_LD|BPF_W|BPF_IND:
                        k = X + fentry->k;