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 <>
Cc: Wey-Yi Guy <>
Signed-off-by: David S. Miller <>
7 files changed