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Date: Tue, 17 Nov 2020 14:06:28 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>, Matthieu Baerts <matthieu.baerts@...sares.net>, Jakub Kicinski <kuba@...nel.org> Subject: [PATCH 5.9 248/255] mptcp: provide rmem[0] limit From: Paolo Abeni <pabeni@...hat.com> [ Upstream commit 989ef49bdf100cc772b3a8737089df36b1ab1e30 ] The mptcp proto struct currently does not provide the required limit for forward memory scheduling. Under pressure sk_rmem_schedule() will unconditionally try to use such field and will oops. Address the issue inheriting the tcp limit, as we already do for the wmem one. Fixes: 9c3f94e1681b ("mptcp: add missing memory scheduling in the rx path") Signed-off-by: Paolo Abeni <pabeni@...hat.com> Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net> Link: https://lore.kernel.org/r/37af798bd46f402fb7c79f57ebbdd00614f5d7fa.1604861097.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski <kuba@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/mptcp/protocol.c | 1 + 1 file changed, 1 insertion(+) --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -2122,6 +2122,7 @@ static struct proto mptcp_prot = { .memory_pressure = &tcp_memory_pressure, .stream_memory_free = mptcp_memory_free, .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), + .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), .sysctl_mem = sysctl_tcp_mem, .obj_size = sizeof(struct mptcp_sock), .slab_flags = SLAB_TYPESAFE_BY_RCU,
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