CVE-2024-27053

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

wifi: wilc1000: fix RCU usage in connect path

With lockdep enabled, calls to the connect function from cfg802.11 layer lead to the following warning:

============================= WARNING: suspicious RCU usage 6.7.0-rc1-wt+ #333 Not tainted

drivers/net/wireless/microchip/wilc1000/hif.c:386 suspicious rcu_dereference_check() usage! […] stack backtrace: CPU: 0 PID: 100 Comm: wpa_supplicant Not tainted 6.7.0-rc1-wt+ #333 Hardware name: Atmel SAMA5 unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x34/0x48 dump_stack_lvl from wilc_parse_join_bss_param+0x7dc/0x7f4 wilc_parse_join_bss_param from connect+0x2c4/0x648 connect from cfg80211_connect+0x30c/0xb74 cfg80211_connect from nl80211_connect+0x860/0xa94 nl80211_connect from genl_rcv_msg+0x3fc/0x59c genl_rcv_msg from netlink_rcv_skb+0xd0/0x1f8 netlink_rcv_skb from genl_rcv+0x2c/0x3c genl_rcv from netlink_unicast+0x3b0/0x550 netlink_unicast from netlink_sendmsg+0x368/0x688 netlink_sendmsg from ____sys_sendmsg+0x190/0x430 ____sys_sendmsg from ___sys_sendmsg+0x110/0x158 ___sys_sendmsg from sys_sendmsg+0xe8/0x150 sys_sendmsg from ret_fast_syscall+0x0/0x1c

This warning is emitted because in the connect path, when trying to parse target BSS parameters, we dereference a RCU pointer whithout being in RCU critical section. Fix RCU dereference usage by moving it to a RCU read critical section. To avoid wrapping the whole wilc_parse_join_bss_param under the critical section, just use the critical section to copy ies data

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/205c50306acf58a335eb19fa84e40140f4fe814f
• https://git.kernel.org/stable/c/4bfd20d5f5c62b5495d6c0016ee6933bd3add7ce
• https://git.kernel.org/stable/c/5800ec78775c0cd646f71eb9bf8402fb794807de
• https://git.kernel.org/stable/c/745003b5917b610352f52fe0d11ef658d6471ec2
• https://git.kernel.org/stable/c/b4bbf38c350acb6500cbe667b1e2e68f896e4b38
• https://git.kernel.org/stable/c/d80fc436751cfa6b02a8eda74eb6cce7dadfe5a2
• https://git.kernel.org/stable/c/dd50d3ead6e3707bb0a5df7cc832730c93ace3a7
• https://git.kernel.org/stable/c/e556006de4ea93abe2b46cba202a2556c544b8b2