Description

In the Linux kernel, the following vulnerability has been resolved: net: mscc: ocelot: add missing lock protection in ocelot_port_xmit_inj() ocelot_port_xmit_inj() calls ocelot_can_inject() and ocelot_port_inject_frame() without holding the injection group lock. Both functions contain lockdep_assert_held() for the injection lock, and the correct caller felix_port_deferred_xmit() properly acquires the lock using ocelot_lock_inj_grp() before calling these functions. Add ocelot_lock_inj_grp()/ocelot_unlock_inj_grp() around the register injection path to fix the missing lock protection. The FDMA path is not affected as it uses its own locking mechanism.

References 6

• git.kernel.org https://git.kernel.org/stable/c/026f6513c5880c2c89e38ad66bbec2868f978605
• git.kernel.org https://git.kernel.org/stable/c/0b217a40156f497e09dd20d3f7baec40c785f386
• git.kernel.org https://git.kernel.org/stable/c/51c32ae7fae14552d79f7139614b77c1bbd57a48
• git.kernel.org https://git.kernel.org/stable/c/63da961381e0d979459dede713001f8452364477
• git.kernel.org https://git.kernel.org/stable/c/7ac58d8832802ec89baa7539e13e6d58a88cce04
• git.kernel.org https://git.kernel.org/stable/c/cc1b179f778f98270bdbbb48d183b4b6427ae198

Remediation