From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 31 Oct 2014 22:51:35 +0000 (-0700)
Subject: net: systemport: do not crash freeing an unitialized TX ring
X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~119^2~50^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=914adb55afbc7e449512f609de19e548d1054480;p=pandora-kernel.git

net: systemport: do not crash freeing an unitialized TX ring

Callers of bcm_sysport_init_tx_ring() can currently fail, and will
always call bcm_sysport_fini_tx_ring() in a loop ending at the number of
TX queues (32) without checking if the TX ring was successfully
initialized or not.

Update bcm_sysport_fini_tx_ring() to return early and avoid a crash
de-referencing ring->cbs if the TX ring was not initialized, since
ring->cbs is the last part of the initialization done by
bcm_sysport_init_tx_ring() that could fail.

Fixes: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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