From: Liu Jian <liujian56@huawei.com>
Date: Wed, 27 Apr 2022 19:51:50 +0800
Subject: bpf, sockmap: Call skb_linearize only when required in
sk_psock_skb_ingress_enqueue
Patch-mainline: v5.19-rc1
Git-commit: 3527bfe6a92d940abfca87929207e734039f496b
References: jsc#PED-1377
The skb_to_sgvec fails only when the number of frag_list and frags
exceeds MAX_MSG_FRAGS. Therefore, we can call skb_linearize only
when the conversion fails.
Signed-off-by: Liu Jian <liujian56@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220427115150.210213-1-liujian56@huawei.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
net/core/skmsg.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
--- a/net/core/skmsg.c
+++ b/net/core/skmsg.c
@@ -524,16 +524,20 @@ static int sk_psock_skb_ingress_enqueue(
{
int num_sge, copied;
- /* skb linearize may fail with ENOMEM, but lets simply try again
- * later if this happens. Under memory pressure we don't want to
- * drop the skb. We need to linearize the skb so that the mapping
- * in skb_to_sgvec can not error.
- */
- if (skb_linearize(skb))
- return -EAGAIN;
num_sge = skb_to_sgvec(skb, msg->sg.data, off, len);
- if (unlikely(num_sge < 0))
- return num_sge;
+ if (num_sge < 0) {
+ /* skb linearize may fail with ENOMEM, but lets simply try again
+ * later if this happens. Under memory pressure we don't want to
+ * drop the skb. We need to linearize the skb so that the mapping
+ * in skb_to_sgvec can not error.
+ */
+ if (skb_linearize(skb))
+ return -EAGAIN;
+
+ num_sge = skb_to_sgvec(skb, msg->sg.data, off, len);
+ if (unlikely(num_sge < 0))
+ return num_sge;
+ }
copied = len;
msg->sg.start = 0;