Commit 04c350b1 authored by Kuniyuki Iwashima's avatar Kuniyuki Iwashima Committed by Alexei Starovoitov
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bpf: Fix SO_RCVBUF/SO_SNDBUF handling in _bpf_setsockopt(). 



The commit 4057765f ("sock: consistent handling of extreme
SO_SNDBUF/SO_RCVBUF values") added a change to prevent underflow
in setsockopt() around SO_SNDBUF/SO_RCVBUF.

This patch adds the same change to _bpf_setsockopt().

Fixes: 4057765f ("sock: consistent handling of extreme SO_SNDBUF/SO_RCVBUF values")
Signed-off-by: default avatarKuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220104013153.97906-2-kuniyu@amazon.co.jp
parent a5bebc4f

net/core/filter.c

+2 −0
Original line number Diff line number Diff line
@@ -4741,12 +4741,14 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, 
		switch (optname) {

		case SO_RCVBUF:

			val = min_t(u32, val, sysctl_rmem_max);

			val = min_t(int, val, INT_MAX / 2);

			sk->sk_userlocks |= SOCK_RCVBUF_LOCK;

			WRITE_ONCE(sk->sk_rcvbuf,

				   max_t(int, val * 2, SOCK_MIN_RCVBUF));

			break;

		case SO_SNDBUF:

			val = min_t(u32, val, sysctl_wmem_max);

			val = min_t(int, val, INT_MAX / 2);

			sk->sk_userlocks |= SOCK_SNDBUF_LOCK;

			WRITE_ONCE(sk->sk_sndbuf,

				   max_t(int, val * 2, SOCK_MIN_SNDBUF));