4.17-stable review patch. If anyone has any objections, please let me know.
------------------ From: John Fastabend <[email protected]> commit 7ebc14d507b4b55105da8d1a1eda323381529cc7 upstream. Currently, when a sock is closed and the bpf_tcp_close() callback is used we remove memory but do not free the skb. Call consume_skb() if the skb is attached to the buffer. Reported-by: [email protected] Fixes: 1aa12bdf1bfb ("bpf: sockmap, add sock close() hook to remove socks") Signed-off-by: John Fastabend <[email protected]> Signed-off-by: Alexei Starovoitov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- kernel/bpf/sockmap.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/kernel/bpf/sockmap.c +++ b/kernel/bpf/sockmap.c @@ -471,7 +471,8 @@ static int free_sg(struct sock *sk, int while (sg[i].length) { free += sg[i].length; sk_mem_uncharge(sk, sg[i].length); - put_page(sg_page(&sg[i])); + if (!md->skb) + put_page(sg_page(&sg[i])); sg[i].length = 0; sg[i].page_link = 0; sg[i].offset = 0; @@ -480,6 +481,8 @@ static int free_sg(struct sock *sk, int if (i == MAX_SKB_FRAGS) i = 0; } + if (md->skb) + consume_skb(md->skb); return free; }
