mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 09:12:39 +00:00
46 lines
1.4 KiB
Diff
46 lines
1.4 KiB
Diff
|
From dd462c6eb2ba6af01ae38644183216c4d5603d90 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Jan Kiszka <jan.kiszka@siemens.com>
|
||
|
|
Date: Tue, 3 Jan 2017 08:50:01 +0100
|
||
|
|
Subject: [PATCH] ivshmem-net: Switch to relative descriptor addresses
|
||
|
|
|
||
|
|
Make sure that we do not depend on identity-mapped shared memory
|
||
|
|
regions.
|
||
|
|
|
||
|
|
This also fixes an off-by-one in the range check of ivshm_net_desc_data.
|
||
|
|
|
||
|
|
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
|
||
|
|
(cherry picked from commit fe9c9dd6373892591a7d6b165c3c43045eb349c1)
|
||
|
|
---
|
||
|
|
drivers/net/ivshmem-net.c | 8 ++++----
|
||
|
|
1 file changed, 4 insertions(+), 4 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/net/ivshmem-net.c
|
||
|
|
+++ b/drivers/net/ivshmem-net.c
|
||
|
|
@@ -123,14 +123,14 @@ static void *ivshm_net_desc_data(struct
|
||
|
|
struct vring_desc *desc,
|
||
|
|
u32 *len)
|
||
|
|
{
|
||
|
|
- u64 addr = READ_ONCE(desc->addr);
|
||
|
|
+ u64 offs = READ_ONCE(desc->addr);
|
||
|
|
u32 dlen = READ_ONCE(desc->len);
|
||
|
|
void *data;
|
||
|
|
|
||
|
|
- if (addr < in->shmaddr || desc->addr > in->shmaddr + in->shmlen)
|
||
|
|
+ if (offs >= in->shmlen)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
- data = in->shm + (addr - in->shmaddr);
|
||
|
|
+ data = in->shm + offs;
|
||
|
|
|
||
|
|
if (data < q->data || data >= q->end)
|
||
|
|
return NULL;
|
||
|
|
@@ -317,7 +317,7 @@ static int ivshm_net_tx_frame(struct net
|
||
|
|
buf = tx->data + head;
|
||
|
|
skb_copy_and_csum_dev(skb, buf);
|
||
|
|
|
||
|
|
- desc->addr = in->shmaddr + (buf - in->shm);
|
||
|
|
+ desc->addr = buf - in->shm;
|
||
|
|
desc->len = skb->len;
|
||
|
|
|
||
|
|
avail = tx->last_avail_idx++ & (vr->num - 1);
|