mwifiex: fix large amsdu packets causing firmware hang

Sometimes host prepares and downloads a large amsdu packet to firmware
which leads to a memory corruption in firmware.
The reason is __dev_alloc_skb() may allocate larger buffer than required
size. This patch solves the problem by checking "adapter->tx_buf_size"
instead of relying on skb_tailroom().

Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/marvell/mwifiex/11n_aggr.c b/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
index dc49c3de1f25..c47d6366875d 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n_aggr.c
@@ -205,7 +205,8 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 
         do {
                 /* Check if AMSDU can accommodate this MSDU */
-                if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
+                if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
+                    adapter->tx_buf_size)
                         break;
 
                 skb_src = skb_dequeue(&pra_list->skb_head);