From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed, 23 Oct 2013 08:59:18 +0000 (+0200)
Subject: drbd: fix decoding of bitmap vli rle for device sizes > 64 TB
X-Git-Tag: v3.13-rc1~100^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d2da5b0cb522c48f8e2f311e6e9b212535371b56;p=pandora-kernel.git

drbd: fix decoding of bitmap vli rle for device sizes > 64 TB

Symptoms: disconnect after bitmap exchange due to
bitmap overflow (e:49731075554) while decoding bm RLE packet

In the decoding step of the variable length integer run length encoding
there was potentially an uncatched bitshift by wordsize (variable >> 64).

The result of which is "undefined" :(
(only "sometimes" the result is the desired 0)

Fix: don't do any bit shift magic for shift == 64, just assign.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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