From 996f02e5bafad2815e72821c19d41fb5297e4dad Mon Sep 17 00:00:00 2001 From: Martin Schiller Date: Tue, 21 Jan 2020 10:42:33 +0100 Subject: [PATCH] lantiq: ltq-ptm: vr9: fix skb handling in ptm_hard_start_xmit() Call skb_orphan(skb) to call the owner's destructor function and make the skb unowned. This is necessary to prevent sk_wmem_alloc of a socket from overflowing, which leads to ENOBUFS errors on application level. Signed-off-by: Martin Schiller --- package/kernel/lantiq/ltq-ptm/Makefile | 2 +- package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/package/kernel/lantiq/ltq-ptm/Makefile b/package/kernel/lantiq/ltq-ptm/Makefile index 73fd63f42b..8f4db69411 100644 --- a/package/kernel/lantiq/ltq-ptm/Makefile +++ b/package/kernel/lantiq/ltq-ptm/Makefile @@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk include $(INCLUDE_DIR)/kernel.mk PKG_NAME:=ltq-ptm -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_MAINTAINER:=John Crispin PKG_LICENSE:=GPL-2.0+ diff --git a/package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c b/package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c index 9e24c69d94..46a52e29d8 100644 --- a/package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c +++ b/package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c @@ -336,6 +336,9 @@ static int ptm_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) dma_cache_wback((unsigned long)skb->data, skb->len); } + /* make the skb unowned */ + skb_orphan(skb); + *(struct sk_buff **)((unsigned int)skb->data - byteoff - sizeof(struct sk_buff *)) = skb; /* write back to physical memory */ dma_cache_wback((unsigned long)skb->data - byteoff - sizeof(struct sk_buff *), skb->len + byteoff + sizeof(struct sk_buff *)); -- 2.30.2