From: Guillaume Chazarain <guichaz@yahoo.fr>
Date: Fri, 21 Jul 2006 21:45:25 +0000 (-0700)
Subject: [PKT_SCHED] netem: Fix slab corruption with netem (2nd try)
X-Git-Tag: v2.6.18-rc3~59^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89e1df74f841fc31e81838d30594c4eff01859f8;p=pandora-kernel.git

[PKT_SCHED] netem: Fix slab corruption with netem (2nd try)

CONFIG_DEBUG_SLAB found the following bug:
netem_enqueue() in sch_netem.c gets a pointer inside a slab object:
struct netem_skb_cb *cb = (struct netem_skb_cb *)skb->cb;
But then, the slab object may be freed:
skb = skb_unshare(skb, GFP_ATOMIC)
cb is still pointing inside the freed skb, so here is a patch to
initialize cb later, and make it clear that initializing it sooner
is a bad idea.

[From Stephen Hemminger: leave cb unitialized in order to let gcc
complain in case of use before initialization]

Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
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