5.4-stable review patch. If anyone has any objections, please let me know.
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From: Jiayuan Chen jiayuan.chen@linux.dev
[ Upstream commit 79f0c39ae7d3dc628c01b02f23ca5d01f9875040 ]
When we specify apply_bytes, we divide the msg into multiple segments, each with a length of 'send', and every time we send this part of the data using tcp_bpf_sendmsg_redir(), we use sk_msg_return_zero() to uncharge the memory of the specified 'send' size.
However, if the first segment of data fails to send, for example, the peer's buffer is full, we need to release all of the msg. When releasing the msg, we haven't uncharged the memory of the subsequent segments.
This modification does not make significant logical changes, but only fills in the missing uncharge places.
This issue has existed all along, until it was exposed after we added the apply test in test_sockmap: commit 3448ad23b34e ("selftests/bpf: Add apply_bytes test to test_txmsg_redir_wait_sndmem in test_sockmap")
Fixes: d3b18ad31f93 ("tls: add bpf support to sk_msg handling") Reported-by: Cong Wang xiyou.wangcong@gmail.com Closes: https://lore.kernel.org/bpf/aAmIi0vlycHtbXeb@pop-os.localdomain/T/#t Signed-off-by: Jiayuan Chen jiayuan.chen@linux.dev Signed-off-by: Martin KaFai Lau martin.lau@kernel.org Acked-by: John Fastabend john.fastabend@gmail.com Reviewed-by: Cong Wang xiyou.wangcong@gmail.com Link: https://lore.kernel.org/r/20250425060015.6968-2-jiayuan.chen@linux.dev Signed-off-by: Sasha Levin sashal@kernel.org --- net/tls/tls_sw.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index 03f608da594e5..432bce3293923 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -856,6 +856,13 @@ static int bpf_exec_tx_verdict(struct sk_msg *msg, struct sock *sk, err = tcp_bpf_sendmsg_redir(sk_redir, &msg_redir, send, flags); lock_sock(sk); if (err < 0) { + /* Regardless of whether the data represented by + * msg_redir is sent successfully, we have already + * uncharged it via sk_msg_return_zero(). The + * msg->sg.size represents the remaining unprocessed + * data, which needs to be uncharged here. + */ + sk_mem_uncharge(sk, msg->sg.size); *copied -= sk_msg_free_nocharge(sk, &msg_redir); msg->sg.size = 0; }