[gnutls-devel] fixes on 3.3.x gnutls branch, why not this one?

[Andreas Metzler]

Hello,

is there a reason why this patch was cherrypicked for the 3.5.x
branch but not for 3.3.x?
e2b02861caea3cb9a173e6993640b4e7112bdb44
pencdk: read_attribute: account buffer size

That ensures that there is no read past the end of buffer.

Resolves the oss-fuzz found bug:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=391

Relates: #159

tia, cu Andreas
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