Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.

References 8

• git.kernel.org https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee
• git.kernel.org https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4
• git.kernel.org https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b
• git.kernel.org https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142
• git.kernel.org https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d
• git.kernel.org https://git.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91
• git.kernel.org https://git.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11
• git.kernel.org https://git.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3

Remediation