From: John Fastabend <john.fastabend@gmail.com>
Date: Sat, 11 Jan 2020 06:12:03 +0000
Subject: bpf: Sockmap/tls, msg_push_data may leave end mark in place
Patch-mainline: v5.5-rc7
Git-commit: cf21e9ba1eb86c9333ca5b05b2f1cc94021bcaef
References: bsc#1155518

Leaving an incorrect end mark in place when passing to crypto
layer will cause crypto layer to stop processing data before
all data is encrypted. To fix clear the end mark on push
data instead of expecting users of the helper to clear the
mark value after the fact.

This happens when we push data into the middle of a skmsg and
have room for it so we don't do a set of copies that already
clear the end flag.

Fixes: 6fff607e2f14b ("bpf: sk_msg program helper bpf_msg_push_data")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/bpf/20200111061206.8028-6-john.fastabend@gmail.com
Acked-by: Gary Lin <glin@suse.com>
---
 net/core/filter.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2415,6 +2415,7 @@ BPF_CALL_4(bpf_msg_push_data, struct sk_
 
 		sk_msg_iter_var_next(i);
 		sg_unmark_end(psge);
+		sg_unmark_end(&rsge);
 		sk_msg_iter_next(msg, end);
 	}