This is a note to let you know that I've just added the patch titled
brcmfmac: Make skb header writable before use
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-make-skb-header-writable-before-use.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 9cc4b7cb86cbcc6330a3faa8cd65268cd2d3c227 Mon Sep 17 00:00:00 2001
From: James Hughes <james.hughes@xxxxxxxxxxxxxxx>
Date: Tue, 25 Apr 2017 10:15:06 +0100
Subject: brcmfmac: Make skb header writable before use
From: James Hughes <james.hughes@xxxxxxxxxxxxxxx>
commit 9cc4b7cb86cbcc6330a3faa8cd65268cd2d3c227 upstream.
The driver was making changes to the skb_header without
ensuring it was writable (i.e. uncloned).
This patch also removes some boiler plate header size
checking/adjustment code as that is also handled by the
skb_cow_header function used to make header writable.
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 | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)
--- a/drivers/net/wireless/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/core.c
@@ -232,22 +232,13 @@ static netdev_tx_t brcmf_netdev_start_xm
goto done;
}
- /* Make sure there's enough room for any header */
- if (skb_headroom(skb) < drvr->hdrlen) {
- struct sk_buff *skb2;
-
- brcmf_dbg(INFO, "%s: insufficient headroom\n",
+ /* Make sure there's enough writable headroom*/
+ ret = skb_cow_head(skb, drvr->hdrlen);
+ if (ret < 0) {
+ brcmf_err("%s: skb_cow_head failed\n",
brcmf_ifname(drvr, ifp->bssidx));
- drvr->bus_if->tx_realloc++;
- skb2 = skb_realloc_headroom(skb, drvr->hdrlen);
dev_kfree_skb(skb);
- skb = skb2;
- if (skb == NULL) {
- brcmf_err("%s: skb_realloc_headroom failed\n",
- brcmf_ifname(drvr, ifp->bssidx));
- ret = -ENOMEM;
- goto done;
- }
+ goto done;
}
/* validate length for ether packet */
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