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Subject[PATCH 4.20 162/183] mac80211: allocate tailroom for forwarded mesh packets
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@nbd.name>

commit 51d0af222f6fa43134c6187ab4f374630f6e0d96 upstream.

Forwarded packets enter the tx path through ieee80211_add_pending_skb,
which skips the ieee80211_skb_resize call.
Fixes WARN_ON in ccmp_encrypt_skb and resulting packet loss.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/mac80211/rx.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2640,6 +2640,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
struct ieee80211_sub_if_data *sdata = rx->sdata;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
u16 ac, q, hdrlen;
+ int tailroom = 0;

hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
@@ -2726,8 +2727,12 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
if (!ifmsh->mshcfg.dot11MeshForwarding)
goto out;

+ if (sdata->crypto_tx_tailroom_needed_cnt)
+ tailroom = IEEE80211_ENCRYPT_TAILROOM;
+
fwd_skb = skb_copy_expand(skb, local->tx_headroom +
- sdata->encrypt_headroom, 0, GFP_ATOMIC);
+ sdata->encrypt_headroom,
+ tailroom, GFP_ATOMIC);
if (!fwd_skb)
goto out;


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