net: ieee802154: at86rf230: Stop leaking skb's

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: ieee802154: at86rf230: Stop leaking skb's Upon error the ieee802154_xmit_complete() helper is not called. Only ieee802154_wake_queue() is called manually. In the Tx case we then leak the skb structure. Free the skb structure upon error before returning when appropriate. As the 'is_tx = 0' cannot be moved in the complete handler because of a possible race between the delay in switching to STATE_RX_AACK_ON and a new interrupt, we introduce an intermediate 'was_tx' boolean just for this purpose. There is no Fixes tag applying here, many changes have been made on this area and the issue kind of always existed.

References

• https://git.kernel.org/stable/c/d2a1eaf51b7d4412319adb6acef114ba472d1692
• https://git.kernel.org/stable/c/af649e5c95f56df64363bc46f6746b87819f9c0d
• https://git.kernel.org/stable/c/6312f6a53fd3ea38125dcaca5e3c9aa7d8a60cf7
• https://git.kernel.org/stable/c/455ef08d6e5473526fa6763f75a93f7198206966
• https://git.kernel.org/stable/c/0fd484644c68897c490a3307bfcc8bf767df5a43
• https://git.kernel.org/stable/c/23b2a25382400168427ea278f3d8bf4ecfd333bf
• https://git.kernel.org/stable/c/1c72f04d52b7200bb83426a9bed378668271ea4a
• https://git.kernel.org/stable/c/e5ce576d45bf72fd0e3dc37eff897bfcc488f6a9