mwifiex: remove redundant dma padding in AMSDU

commit 5f0a221f59ad6b72202ef9c6e232086de8c336f2 upstream.

We already ensure 64 bytes alignment and add padding if required
during skb_aggr allocation.

Alignment and padding in mwifiex_11n_form_amsdu_txpd() is redundant.
We may end up accessing more data than allocated size with this.

This patch fixes following issue by removing redundant padding.

[  370.241338] skbuff: skb_over_panic: text:ffffffffc046946a len:3550
put:72 head:ffff880000110000 data:ffff8800001100e4 tail:0xec2 end:0xec0 dev:<NULL>
[  370.241374] ------------[ cut here ]------------
[  370.241382] kernel BUG at net/core/skbuff.c:104!
  370.244032] Call Trace:
[  370.244041]  [<ffffffff8c3df5ec>] skb_put+0x44/0x45
[  370.244055]  [<ffffffffc046946a>]
mwifiex_11n_aggregate_pkt+0x1e9/0xa50 [mwifiex]
[  370.244067]  [<ffffffffc0467c16>] mwifiex_wmm_process_tx+0x44a/0x6b7
[mwifiex]
[  370.244074]  [<ffffffffc0411eb8>] ? 0xffffffffc0411eb8
[  370.244084]  [<ffffffffc046116b>] mwifiex_main_process+0x476/0x5a5
[mwifiex]
[  370.244098]  [<ffffffffc0461298>] mwifiex_main_process+0x5a3/0x5a5
[mwifiex]
[  370.244113]  [<ffffffff8be7e9ff>] process_one_work+0x1a4/0x309
[  370.244123]  [<ffffffff8be7f4ca>] worker_thread+0x20c/0x2ee
[  370.244130]  [<ffffffff8be7f2be>] ? rescuer_thread+0x383/0x383
[  370.244136]  [<ffffffff8be7f2be>] ? rescuer_thread+0x383/0x383
[  370.244143]  [<ffffffff8be83742>] kthread+0x11c/0x124
[  370.244150]  [<ffffffff8be83626>] ? kthread_parkme+0x24/0x24
[  370.244157]  [<ffffffff8c4da1ef>] ret_from_fork+0x3f/0x70
[  370.244168]  [<ffffffff8be83626>] ? kthread_parkme+0x24/0x24

Fixes: 84b313b35f8158d ("mwifiex: make tx packet 64 byte DMA aligned")
Signed-off-by: Xinming Hu <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 12 deletions

diff --git a/drivers/net/wireless/marvell/mwifiex/11n_aggr.c b/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
index c47d6366875d..a75013ac84d7 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
@@ -101,13 +101,6 @@ mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
 {
         struct txpd *local_tx_pd;
         struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
-        unsigned int pad;
-        int headroom = (priv->adapter->iface_type ==
-                        MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
-
-        pad = ((void *)skb->data - sizeof(*local_tx_pd) -
-                headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
-        skb_push(skb, pad);
 
         skb_push(skb, sizeof(*local_tx_pd));
 
@@ -121,12 +114,10 @@ mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
         local_tx_pd->bss_num = priv->bss_num;
         local_tx_pd->bss_type = priv->bss_type;
         /* Always zero as the data is followed by struct txpd */
-        local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) +
-                                                 pad);
+        local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
         local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
         local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
-                                                 sizeof(*local_tx_pd) -
-                                                 pad);
+                                                 sizeof(*local_tx_pd));
 
         if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
                 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
@@ -190,7 +181,11 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
                                        ra_list_flags);
                 return -1;
         }
-        skb_reserve(skb_aggr, MWIFIEX_MIN_DATA_HEADER_LEN);
+
+        /* skb_aggr->data already 64 byte align, just reserve bus interface
+         * header and txpd.
+         */
+        skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
         tx_info_aggr =  MWIFIEX_SKB_TXCB(skb_aggr);
 
         memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));