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| author | Felix Fietkau <nbd@nbd.name> | 2020-01-13 21:21:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-23 10:20:33 +0300 |
| commit | 99e739733fd2794ad9b27d99294061e756046ae2 (patch) | |
| tree | 0a77c65d0a129f4bd113c7a8b2c1c728a2e46744 | |
| parent | 9510f18a019aa30d50d499fdae1176183132368c (diff) | |
| download | linux-99e739733fd2794ad9b27d99294061e756046ae2.tar.xz | |
cfg80211: fix page refcount issue in A-MSDU decap
commit 81c044fc3bdc5b7be967cd3682528ea94b58c06a upstream.
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>
Link: https://lore.kernel.org/r/20200113182107.20461-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/wireless/util.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c index 2234817f5dbb..935929b45411 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -652,7 +652,7 @@ __frame_add_frag(struct sk_buff *skb, struct page *page, 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); } |