[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>

1 files changed, 2 insertions, 6 deletions

diff --git a/net/core/filter.c b/net/core/filter.c
index 3923428a840f..cd91a24f9720 100644
--- 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;