diff options
| author | Felix Fietkau <nbd@nbd.name> | 2026-03-14 09:54:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-03-25 13:10:42 +0300 |
| commit | 06e769dddcbeb3baf2ce346273b53dd61fdbecf4 (patch) | |
| tree | 9eb14ff211208ecc538301243530ab28da7cfa46 /net/mac80211 | |
| parent | 46c670ff1ff466e5eccb3940f726586473dc053c (diff) | |
| download | linux-06e769dddcbeb3baf2ce346273b53dd61fdbecf4.tar.xz | |
wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure
[ Upstream commit d5ad6ab61cbd89afdb60881f6274f74328af3ee9 ]
ieee80211_tx_prepare_skb() has three error paths, but only two of them
free the skb. The first error path (ieee80211_tx_prepare() returning
TX_DROP) does not free it, while invoke_tx_handlers() failure and the
fragmentation check both do.
Add kfree_skb() to the first error path so all three are consistent,
and remove the now-redundant frees in callers (ath9k, mt76,
mac80211_hwsim) to avoid double-free.
Document the skb ownership guarantee in the function's kdoc.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/20260314065455.2462900-1-nbd@nbd.name
Fixes: 06be6b149f7e ("mac80211: add ieee80211_tx_prepare_skb() helper function")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/tx.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 160667be3f4d..2f830001b0cd 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -1896,8 +1896,10 @@ bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, struct ieee80211_tx_data tx; struct sk_buff *skb2; - if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) + if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) { + kfree_skb(skb); return false; + } info->band = band; info->control.vif = vif; |