This is a note to let you know that I've just added the patch titled
ath9k_htc: Restore skb headroom when returning skb to mac80211
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_htc-restore-skb-headroom-when-returning-skb-to-mac80211.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From d2e9fc141e2aa21f4b35ee27072d84e9aa6e2ba0 Mon Sep 17 00:00:00 2001
From: Helmut Schaa <helmut.schaa@xxxxxxxxxxxxxx>
Date: Fri, 16 Aug 2013 21:39:40 +0200
Subject: ath9k_htc: Restore skb headroom when returning skb to mac80211
From: Helmut Schaa <helmut.schaa@xxxxxxxxxxxxxx>
commit d2e9fc141e2aa21f4b35ee27072d84e9aa6e2ba0 upstream.
ath9k_htc adds padding between the 802.11 header and the payload during
TX by moving the header. When handing the frame back to mac80211 for TX
status handling the header is not moved back into its original position.
This can result in a too small skb headroom when entering ath9k_htc
again (due to a soft retransmission for example) causing an
skb_under_panic oops.
Fix this by moving the 802.11 header back into its original position
before returning the frame to mac80211 as other drivers like rt2x00
or ath5k do.
Reported-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Helmut Schaa <helmut.schaa@xxxxxxxxxxxxxx>
Tested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/htc_drv_txrx.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_txrx.c
@@ -448,6 +448,7 @@ static void ath9k_htc_tx_process(struct
struct ieee80211_conf *cur_conf = &priv->hw->conf;
bool txok;
int slot;
+ int hdrlen, padsize;
slot = strip_drv_header(priv, skb);
if (slot < 0) {
@@ -504,6 +505,15 @@ send_mac80211:
ath9k_htc_tx_clear_slot(priv, slot);
+ /* Remove padding before handing frame back to mac80211 */
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+
+ padsize = hdrlen & 3;
+ if (padsize && skb->len > hdrlen + padsize) {
+ memmove(skb->data + padsize, skb->data, hdrlen);
+ skb_pull(skb, padsize);
+ }
+
/* Send status to mac80211 */
ieee80211_tx_status(priv->hw, skb);
}
Patches currently in stable-queue which might be from helmut.schaa@xxxxxxxxxxxxxx are
queue-3.0/ath9k_htc-restore-skb-headroom-when-returning-skb-to-mac80211.patch
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