mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-26 17:01:14 +00:00
26 lines
881 B
Diff
26 lines
881 B
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Mon, 13 Jan 2020 18:34:31 +0100
|
|
Subject: [PATCH] cfg80211: fix page refcount issue in A-MSDU decap
|
|
|
|
The fragments attached to a skb can be part of a compound page. In that case,
|
|
page_ref_inc will increment the refcount for the wrong page. Fix this by
|
|
using get_page instead, which calls page_ref_inc on the compound head and
|
|
also checks for overflow.
|
|
|
|
Fixes: 2b67f944f88c ("cfg80211: reuse existing page fragments in A-MSDU rx")
|
|
Cc: stable@vger.kernel.org
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/net/wireless/util.c
|
|
+++ b/net/wireless/util.c
|
|
@@ -564,7 +564,7 @@ __frame_add_frag(struct sk_buff *skb, st
|
|
struct skb_shared_info *sh = skb_shinfo(skb);
|
|
int page_offset;
|
|
|
|
- page_ref_inc(page);
|
|
+ get_page(page);
|
|
page_offset = ptr - page_address(page);
|
|
skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
|
|
}
|