This is a note to let you know that I've just added the patch titled
macvtap: fix recovery from gup errors
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
macvtap-fix-recovery-from-gup-errors.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b716ef2d9113847c893a292d9624a53b8b0d472f Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Date: Sun, 23 Jun 2013 17:26:58 +0300
Subject: macvtap: fix recovery from gup errors
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
[ Upstream commit 4c7ab054ab4f5d63625508ed6f8a607184cae7c2 ]
get user pages might fail partially in macvtap zero copy
mode. To recover we need to put all pages that we got,
but code used a wrong index resulting in double-free
errors.
Reported-by: Brad Hubbard <bhubbard@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/macvtap.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -534,8 +534,10 @@ static int zerocopy_sg_from_iovec(struct
return -EMSGSIZE;
num_pages = get_user_pages_fast(base, size, 0, &page[i]);
if (num_pages != size) {
- for (i = 0; i < num_pages; i++)
- put_page(page[i]);
+ int j;
+
+ for (j = 0; j < num_pages; j++)
+ put_page(page[i + j]);
}
truesize = size * PAGE_SIZE;
skb->data_len += len;
Patches currently in stable-queue which might be from mst@xxxxxxxxxx are
queue-3.4/macvtap-correctly-linearize-skb-when-zerocopy-is-used.patch
queue-3.4/macvtap-fix-recovery-from-gup-errors.patch
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