From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 25 Oct 2012 22:31:11 +0000 (+0200)
Subject: ath9k: fix stale pointers potentially causing access to free'd skbs
X-Git-Tag: v3.2.34~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aba58442cc2198273c9815253030e83ba6f42edc;p=pandora-kernel.git

ath9k: fix stale pointers potentially causing access to free'd skbs

commit 8c6e30936a7893a85f6222084f0f26aceb81137a upstream.

bf->bf_next is only while buffers are chained as part of an A-MPDU
in the tx queue. When a tid queue is flushed (e.g. on tearing down
an aggregation session), frames can be enqueued again as normal
transmission, without bf_next being cleared. This can lead to the
old pointer being dereferenced again later.

This patch might fix crashes and "Failed to stop TX DMA!" messages.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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