Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: fix use-after-free in mwifiex_adapter_cleanup() The mwifiex_adapter_cleanup() function uses timer_delete() (non-synchronous) for the wakeup_timer before the adapter structure is freed. This is incorrect because timer_delete() does not wait for any running timer callback to complete. If the wakeup_timer callback (wakeup_timer_fn) is executing when mwifiex_adapter_cleanup() is called, the callback will continue to access adapter fields (adapter->hw_status, adapter->if_ops.card_reset, etc.) which may be freed by mwifiex_free_adapter() called later in the mwifiex_remove_card() path. Use timer_delete_sync() instead to ensure any running timer callback has completed before returning.

References 8

• git.kernel.org https://git.kernel.org/stable/c/030abbae49cf9fd1fba7aa08e15ec81efbeb78cf
• git.kernel.org https://git.kernel.org/stable/c/11869ce402d95519d49b25a2a97741f68d69d103
• git.kernel.org https://git.kernel.org/stable/c/1958a92599b2653d730ccb6f5685fc3fbed21812
• git.kernel.org https://git.kernel.org/stable/c/4e179a60a60c0a5aea245e8e67768343c0f070b8
• git.kernel.org https://git.kernel.org/stable/c/63fe3389b3e092d6c0eeea9fc0318e7918b16618
• git.kernel.org https://git.kernel.org/stable/c/a88f5391dc68f78cae5eb6a8cd341cafee795d3d
• git.kernel.org https://git.kernel.org/stable/c/ae5e95d4157481693be2317e3ffcd84e36010cbb
• git.kernel.org https://git.kernel.org/stable/c/c3508895450cca4aeaf5dbadbb5e582363005264

Remediation