APPLIED: [Disco][SRU][CVE-2019-2181] binder: check for overflow when alloc for security context

[Khaled Elmously]

On 2019-09-26 12:14:46 , Connor Kuehl wrote:
> https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-2181.html
> 
> From the above link:
> 
> 	"In binder_transaction of binder.c in the Android kernel, there is a
> 	possible out of bounds write due to an integer overflow. This could lead to
> 	local escalation of privilege with no additional execution privileges
> 	needed. User interaction is needed for exploitation."
> 
> Clean cherry pick.
> 
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