lzo: check for length overrun in variable length encoding backport

[Florian Fainelli]

Hi,

Could you backport this commit:
72cf90124e87d975d0b2114d930808c58b4c05e4 ("lzo: check for length overrun
in variable length encoding.") into stable kernels older than 3.18?

It should apply cleanly to anything that contains
8b975bd3f9089f8ee5d7bbfd798537b992bbc7e7 ("lib/lzo: Update LZO
compression to current upstream version") which goes as far as 3.9.

Thanks!
-- 
Florian
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