[PATCH 5/9] [NET]: 2.6.13 breaks libpcap (and tcpdump)

[Chris Wright <chrisw@osdl.org>]

[-- Attachment #1: fix-socket-filter-regression.patch --]
[-- Type: text/plain, Size: 1581 bytes --]

-stable review patch.  If anyone has any  objections, please let us know.
------------------

[NET]: 2.6.13 breaks libpcap (and tcpdump)

Patrick McHardy says:

  Never mind, I got it, we never fall through to the second switch
  statement anymore. I think we could simply break when load_pointer
  returns NULL. The switch statement will fall through to the default
  case and return 0 for all cases but 0 > k >= SKF_AD_OFF.

Here's a patch to do just that.

I left BPF_MSH alone because it's really a hack to calculate the IP
header length, which makes no sense when applied to the special data.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@osdl.org>
---
 net/core/filter.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6.13.y/net/core/filter.c
===================================================================
--- linux-2.6.13.y.orig/net/core/filter.c
+++ linux-2.6.13.y/net/core/filter.c
@@ -182,7 +182,7 @@ int sk_run_filter(struct sk_buff *skb, s
 				A = ntohl(*(u32 *)ptr);
 				continue;
 			}
-			return 0;
+			break;
 		case BPF_LD|BPF_H|BPF_ABS:
 			k = fentry->k;
  load_h:
@@ -191,7 +191,7 @@ int sk_run_filter(struct sk_buff *skb, s
 				A = ntohs(*(u16 *)ptr);
 				continue;
 			}
-			return 0;
+			break;
 		case BPF_LD|BPF_B|BPF_ABS:
 			k = fentry->k;
 load_b:
@@ -200,7 +200,7 @@ load_b:
 				A = *(u8 *)ptr;
 				continue;
 			}
-			return 0;
+			break;
 		case BPF_LD|BPF_W|BPF_LEN:
 			A = skb->len;
 			continue;

--