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Change History

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

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.

https://git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4

https://git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108

https://git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9