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authorPaolo Abeni <pabeni@redhat.com>2020-01-21 18:50:49 +0300
committerDavid S. Miller <davem@davemloft.net>2020-01-22 23:09:03 +0300
commitd39ca2590d10712f412add7a88e1dd467a7246f4 (patch)
tree3d994d0fb3e9b9f3087bbdf3540344adb871012c /net/ipv4/udp.c
parentbda6a35505e28b70d48096c933d5949c9b6caf9a (diff)
downloadlinux-d39ca2590d10712f412add7a88e1dd467a7246f4.tar.xz
Revert "udp: do rmem bulk free even if the rx sk queue is empty"
This reverts commit 0d4a6608f68c7532dcbfec2ea1150c9761767d03. Williem reported that after commit 0d4a6608f68c ("udp: do rmem bulk free even if the rx sk queue is empty") the memory allocated by an almost idle system with many UDP sockets can grow a lot. For stable kernel keep the solution as simple as possible and revert the offending commit. Reported-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Diagnosed-by: Eric Dumazet <eric.dumazet@gmail.com> Fixes: 0d4a6608f68c ("udp: do rmem bulk free even if the rx sk queue is empty") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 93a355b6b092..030d43c7c957 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1368,7 +1368,8 @@ static void udp_rmem_release(struct sock *sk, int size, int partial,
if (likely(partial)) {
up->forward_deficit += size;
size = up->forward_deficit;
- if (size < (sk->sk_rcvbuf >> 2))
+ if (size < (sk->sk_rcvbuf >> 2) &&
+ !skb_queue_empty(&up->reader_queue))
return;
} else {
size += up->forward_deficit;