wifi: mac80211: don't return unset power in ieee80211_get_tx_power()
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: don't return unset power in ieee80211_get_tx_power() We can get a UBSAN warning if ieee80211_get_tx_power() returns the INT_MIN value mac80211 internally uses for "unset power level". UBSAN: signed-integer-overflow in net/wireless/nl80211.c:3816:5 -2147483648 * 100 cannot be represented in type 'int' CPU: 0 PID: 20433 Comm: insmod Tainted: G WC OE Call Trace: dump_stack+0x74/0x92 ubsan_epilogue+0x9/0x50 handle_overflow+0x8d/0xd0 __ubsan_handle_mul_overflow+0xe/0x10 nl80211_send_iface+0x688/0x6b0 [cfg80211] [...] cfg80211_register_wdev+0x78/0xb0 [cfg80211] cfg80211_netdev_notifier_call+0x200/0x620 [cfg80211] [...] ieee80211_if_add+0x60e/0x8f0 [mac80211] ieee80211_register_hw+0xda5/0x1170 [mac80211] In this case, simply return an error instead, to indicate that no data is available.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://git.kernel.org/stable/c/717de20abdcd1d4993fa450e28b8086a352620ea
- https://git.kernel.org/stable/c/21a0f310a9f3bfd2b4cf4f382430e638607db846
- https://git.kernel.org/stable/c/2be24c47ac19bf639c48c082486c08888bd603c6
- https://git.kernel.org/stable/c/adc2474d823fe81d8da759207f4f1d3691aa775a
- https://git.kernel.org/stable/c/5a94cffe90e20e8fade0b9abd4370bd671fe87c7
- https://git.kernel.org/stable/c/e160ab85166e77347d0cbe5149045cb25e83937f
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