lwip:memory out-of-bounds write

[luminais]

if the parameter'size' of function coap_new_string is not smaller than MEMP_LEN_COAPSTRING, it will leading to memory out-of-bounds write

[luminais]

same with COAP_OPTLIST

[mrdeep1]

Thank you for reporting this. A fix for this has been created in #521 .

[obgm]

Thank you.

@luminais For reporting issues it would be great to have a descriptive and short title, and for the error description, there is an input box the in form that opens when creating a new issue. Having the entire description in the title is a bit difficult to read.

[mrdeep1]

#521 has been merged, and libcoap LwIP support has been re-written in PR #884, and so this should no longer be an issue. LwIP specific memory allocations are no longer used.

[mrdeep1]

Fixed in #939.