net: add a truesize parameter to skb_add_rx_frag()

skb_add_rx_frag() API is misleading.

Network skbs built with this helper can use uncharged kernel memory and
eventually stress/crash machine in OOM.

Add a 'truesize' parameter and then fix drivers in followup patches.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlegacy/3945.c b/drivers/net/wireless/iwlegacy/3945.c
index c5b1d199e0bc..b25c01be0d90 100644
--- a/drivers/net/wireless/iwlegacy/3945.c
+++ b/drivers/net/wireless/iwlegacy/3945.c
@@ -499,7 +499,8 @@ il3945_pass_packet_to_mac80211(struct il_priv *il, struct il_rx_buf *rxb,
                                       le32_to_cpu(rx_end->status), stats);
 
         skb_add_rx_frag(skb, 0, rxb->page,
-                        (void *)rx_hdr->payload - (void *)pkt, len);
+                        (void *)rx_hdr->payload - (void *)pkt, len,
+                        len);
 
         il_update_stats(il, false, fc, len);
         memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));