netdev - [BUG] problem with BPF in PF_PACKET sockets, introduced in linux-2.6.19

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Message-Id: <200701041747.46358.raivis@mt.lv>
Date:	Thu, 4 Jan 2007 17:47:46 +0200
From:	Raivis Bucis <raivis@...lv>
To:	netdev@...r.kernel.org
Cc:	waltje@...lt.NL.Mugnet.ORG, gw4pts@...pts.ampr.org
Subject: [BUG] problem with BPF in PF_PACKET sockets, introduced in linux-2.6.19

Hello,

I believe I have found a bug in PF_PACKET socket filtering (introduced in 
linux-2.6.19). If BPF returns values larger than 0x80000000u, run_filter in 
af_packet.c considers that as error instead of simply accepting packet in its 
full length. sk_filter does not have this problem.

Raivis Bucis

Index: linux-2.6.19/net/packet/af_packet.c
===================================================================
--- linux-2.6.19/net/packet/af_packet.c
+++ linux-2.6.19/net/packet/af_packet.c
@@ -447,6 +447,8 @@
                        err = -EPERM;
                else if (*snaplen > err)
                        *snaplen = err;
+               else
+                       err = *snaplen;
        }
        rcu_read_unlock_bh();
 
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