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