From: Michal Kubecek <mkubecek@suse.cz>
Date: Thu, 17 Oct 2013 13:07:40 +0000 (+0200)
Subject: xfrm: prevent ipcomp scratch buffer race condition
X-Git-Tag: omap-for-v3.13/fixes-for-merge-window-take2~67^2~4^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12e3594698f6c3ab6ebacc79f2fb2ad2bb5952b5;p=pandora-kernel.git

xfrm: prevent ipcomp scratch buffer race condition

In ipcomp_compress(), sortirq is enabled too early, allowing the
per-cpu scratch buffer to be rewritten by ipcomp_decompress()
(called on the same CPU in softirq context) between populating
the buffer and copying the compressed data to the skb.

v2: as pointed out by Steffen Klassert, if we also move the
local_bh_disable() before reading the per-cpu pointers, we can
get rid of get_cpu()/put_cpu().

v3: removed ipcomp_decompress part (as explained by Herbert Xu,
it cannot be called from process context), get rid of cpu
variable (thanks to Eric Dumazet)

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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