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