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The miXart timer notification is a variable length, and if a hardware is screwed up, we may access over the actual data size. Let's add a sanity check and bail out if an invalid value is received. Link: https://lore.kernel.org/r/20211207153323.27098-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>