package/kernel/mac80211/patches/657-0056-rtl8xxxu-Fix-memory-leak-in-handling-rxdesc16-packet.patch

   1 From 5214760261aead3d3546b594e5b7021514ef76d1 Mon Sep 17 00:00:00 2001
   2 From: Jes Sorensen <Jes.Sorensen@redhat.com>
   3 Date: Wed, 28 Sep 2016 14:48:51 -0400
   4 Subject: [PATCH] rtl8xxxu: Fix memory leak in handling rxdesc16 packets
   5
   6 A device running without RX package aggregation could return more data
   7 in the USB packet than the actual network packet. In this case the
   8 could would clone the skb but then determine that that there was no
   9 packet to handle and exit without freeing the cloned skb first.
  10
  11 This has so far only been observed with 8188eu devices, but could
  12 affect others.
  13
  14 Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
  15 ---
  16  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 7 ++++++-
  17  1 file changed, 6 insertions(+), 1 deletion(-)
  18
  19 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  20 +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  21 @@ -5296,7 +5296,12 @@ int rtl8xxxu_parse_rxdesc16(struct rtl8x
  22                 pkt_offset = roundup(pkt_len + drvinfo_sz + desc_shift +
  23                                      sizeof(struct rtl8xxxu_rxdesc16), 128);
  24
  25 -               if (pkt_cnt > 1)
  26 +               /*
  27 +                * Only clone the skb if there's enough data at the end to
  28 +                * at least cover the rx descriptor
  29 +                */
  30 +               if (pkt_cnt > 1 &&
  31 +                   urb_len > (pkt_offset + sizeof(struct rtl8xxxu_rxdesc16)))
  32                         next_skb = skb_clone(skb, GFP_ATOMIC);
  33
  34                 rx_status = IEEE80211_SKB_RXCB(skb);