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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 <ms@dev.tdt.de>
(cherry picked from commit 996f02e5ba)
This commit is contained in:
Martin Schiller 2020-01-21 10:42:33 +01:00 committed by Hauke Mehrtens
parent 0591348b3d
commit ebafb746f0
2 changed files with 4 additions and 1 deletions
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2
package/kernel/lantiq/ltq-ptm/Makefile
View File

@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=ltq-ptm
PKG_RELEASE:=1
PKG_RELEASE:=2
PKG_BUILD_DIR:=$(KERNEL_BUILD_DIR)/ltq-ptm-$(BUILD_VARIANT)
PKG_MAINTAINER:=John Crispin <john@phrozen.org>

3
package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_vdsl.c
View File

@ -334,6 +334,9 @@ 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 *));