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mt7915_eeprom_load_default() copied mt7915_eeprom_size() bytes from the
firmware blob after only checking that it was non-NULL. A truncated
default bin caused an out-of-bounds read past the firmware buffer into
the EEPROM image. Reject a blob smaller than the EEPROM size.
Fixes: beed8bea8d74 ("mt76: mt7915: add mt7916 calibrated data support")
Signed-off-by: Felix Fietkau <[email protected]>