On Wed, May 06, 2020 at 07:50:54PM +0530, ashwin-h wrote:

From: Xin Long <lucien.xin@gmail.com>

commit 9dde27de3e5efa0d032f3c891a0ca833a0d31911 upstream.

sk_forward_alloc's updating is also done on rx path, but to be consistent
we change to use sk_mem_charge() in sctp_skb_set_owner_r().

In sctp_eat_data(), it's not enough to check sctp_memory_pressure only,
which doesn't work for mem_cgroup_sockets_enabled, so we change to use
sk_under_memory_pressure().

When it's under memory pressure, sk_mem_reclaim() and sk_rmem_schedule()
should be called on both RENEGE or CHUNK DELIVERY path exit the memory
pressure status as soon as possible.

Note that sk_rmem_schedule() is using datalen to make things easy there.

Reported-by: Matteo Croce <redacted>
Tested-by: Matteo Croce <redacted>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ashwin H <redacted>
---
 include/net/sctp/sctp.h |  2 +-
 net/sctp/sm_statefuns.c |  6 ++++--
 net/sctp/ulpevent.c     | 19 ++++++++-----------
 net/sctp/ulpqueue.c     |  3 ++-
 4 files changed, 15 insertions(+), 15 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>