This is a note to let you know that I've just added the patch titled
ath9k: fix stale pointers potentially causing access to free'd skbs
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ath9k-fix-stale-pointers-potentially-causing-access-to-free-d-skbs.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 8c6e30936a7893a85f6222084f0f26aceb81137a Mon Sep 17 00:00:00 2001
From: Felix Fietkau <[email protected]>
Date: Fri, 26 Oct 2012 00:31:11 +0200
Subject: ath9k: fix stale pointers potentially causing access to free'd skbs
From: Felix Fietkau <[email protected]>
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 <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/ath/ath9k/xmit.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -272,6 +272,7 @@ static struct ath_buf *ath_tx_get_buffer
}
bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
+ bf->bf_next = NULL;
list_del(&bf->list);
spin_unlock_bh(&sc->tx.txbuflock);
@@ -1488,6 +1489,7 @@ static void ath_tx_send_normal(struct at
if (tid)
INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+ bf->bf_next = NULL;
bf->bf_lastbf = bf;
fi = get_frame_info(bf->bf_mpdu);
ath_buf_set_rate(sc, bf, fi->framelen);
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/ath9k-fix-stale-pointers-potentially-causing-access-to-free-d-skbs.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
