wifi: mt76: mt7915: bound the device EEPROM address before the EFUSE copy

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mt7915_mcu_get_eeprom() copies a fixed EFUSE block into the driver's
dev->mt76.eeprom.data buffer at the offset reported by the MCU response
(res->addr, a device-controlled __le32) without checking it against the
buffer size. A malicious or malfunctioning device can report an arbitrary
address and drive a 16-byte out-of-bounds write past eeprom.data.

Reject a response whose address would place the copy outside eeprom.data
before deriving the destination pointer. Devices that echo the requested
in-bounds offset are unaffected.

Fixes: e57b790146 ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Link: https://patch.msgid.link/20260625-b4-disp-16f99062-v1-1-aee52ecf61b9@proton.me
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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Bryam Vargas 2026-06-25 07:10:26 -05:00 • committed by Felix Fietkau

parent 4361f16601

commit 44b5adfe49

1 changed files with 9 additions and 2 deletions

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drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

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