This is a note to let you know that I've just added the patch titled
brcmfmac: Ensure pointer correctly set if skb data location changes
to the 4.4-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:
brcmfmac-ensure-pointer-correctly-set-if-skb-data-location-changes.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 455a1eb4654c24560eb9dfc634f29cba3d87601e Mon Sep 17 00:00:00 2001
From: James Hughes <james.hughes@xxxxxxxxxxxxxxx>
Date: Mon, 24 Apr 2017 12:40:50 +0100
Subject: brcmfmac: Ensure pointer correctly set if skb data location changes
From: James Hughes <james.hughes@xxxxxxxxxxxxxxx>
commit 455a1eb4654c24560eb9dfc634f29cba3d87601e upstream.
The incoming skb header may be resized if header space is
insufficient, which might change the data adddress in the skb.
Ensure that a cached pointer to that data is correctly set by
moving assignment to after any possible changes.
Signed-off-by: James Hughes <james.hughes@xxxxxxxxxxxxxxx>
Acked-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Arend van Spriel <arend.vanspriel@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/brcm80211/brcmfmac/core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/core.c
@@ -211,7 +211,7 @@ static netdev_tx_t brcmf_netdev_start_xm
int ret;
struct brcmf_if *ifp = netdev_priv(ndev);
struct brcmf_pub *drvr = ifp->drvr;
- struct ethhdr *eh = (struct ethhdr *)(skb->data);
+ struct ethhdr *eh;
brcmf_dbg(DATA, "Enter, idx=%d\n", ifp->bssidx);
@@ -257,6 +257,8 @@ static netdev_tx_t brcmf_netdev_start_xm
goto done;
}
+ eh = (struct ethhdr *)(skb->data);
+
if (eh->h_proto == htons(ETH_P_PAE))
atomic_inc(&ifp->pend_8021x_cnt);
Patches currently in stable-queue which might be from james.hughes@xxxxxxxxxxxxxxx are
queue-4.4/brcmfmac-make-skb-header-writable-before-use.patch
queue-4.4/brcmfmac-ensure-pointer-correctly-set-if-skb-data-location-changes.patch