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| author |   Chih-Kang Chang <gary.chang@realtek.com> | 2021-08-30 15:32:40 +0800 |
|---|---|---|
| committer |   Johannes Berg <johannes.berg@intel.com> | 2021-09-23 13:04:35 +0200 |
| commit | fe94bac626d9c1c5bc98ab32707be8a9d7f8adba (patch) | |
| tree | e74f587ac7268cfeb80cac7523f5e3f62863b6db | |
| parent | Revert "mac80211: do not use low data rates for data frames with no ack flag" (diff) | |
| download | linux-dev-fe94bac626d9c1c5bc98ab32707be8a9d7f8adba.tar.xz linux-dev-fe94bac626d9c1c5bc98ab32707be8a9d7f8adba.zip | |
mac80211: Fix ieee80211_amsdu_aggregate frag_tail bug
In ieee80211_amsdu_aggregate() set a pointer frag_tail point to the
end of skb_shinfo(head)->frag_list, and use it to bind other skb in
the end of this function. But when execute ieee80211_amsdu_aggregate()
->ieee80211_amsdu_realloc_pad()->pskb_expand_head(), the address of
skb_shinfo(head)->frag_list will be changed. However, the
ieee80211_amsdu_aggregate() not update frag_tail after call
pskb_expand_head(). That will cause the second skb can't bind to the
head skb appropriately.So we update the address of frag_tail to fix it.
Fixes: 6e0456b54545 ("mac80211: add A-MSDU tx support")
Signed-off-by: Chih-Kang Chang <gary.chang@realtek.com>
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20210830073240.12736-1-pkshih@realtek.com
[reword comment]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
| -rw-r--r-- | net/mac80211/tx.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 2d1193ed3eb5..824bed71be13 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3380,6 +3380,14 @@ static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) goto out; + /* If n == 2, the "while (*frag_tail)" loop above didn't execute + * and frag_tail should be &skb_shinfo(head)->frag_list. + * However, ieee80211_amsdu_prepare_head() can reallocate it. + * Reload frag_tail to have it pointing to the correct place. + */ + if (n == 2) + frag_tail = &skb_shinfo(head)->frag_list; + /* * Pad out the previous subframe to a multiple of 4 by adding the * padding to the next one, that's being added. Note that head->len |