RFR(xs): 8155211: Ucrypto Library leaks native memory

Ivan Gerasimov ivan.gerasimov at oracle.com
Thu Apr 28 20:51:15 UTC 2016


Ah, please ignore my previous message, I read the code wrongly.

Your fix looks good.

With kind regards,

Ivan


On 28.04.2016 19:12, Ivan Gerasimov wrote:
>
> Hi Thomas!
>
> Wouldn't it make sense to declare
>
> unsigned char bufOut[1];
>
> and avoid allocation/deallocation of this buffer altogether?
>
>
> With kind regards,
>
> Ivan
>
>
> On 28.04.2016 15:40, Thomas Stüfe wrote:
>> Hi all,
>>
>> could you please review this small fix?
>>
>> Webrev: 
>> http://cr.openjdk.java.net/~stuefe/webrevs/8155211-ucrypto-lib-mem-leak/webrev.00/webrev/ 
>> <http://cr.openjdk.java.net/%7Estuefe/webrevs/8155211-ucrypto-lib-mem-leak/webrev.00/webrev/>
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8155211
>>
>> Basically, during benchmarks our Solaris VMs went 
>> out-of-native-memory; when we investigated, we saw ~31million small 
>> lost allocations from nativeCrypto.c:663. Looking at the source shows 
>> that the output buffer is not deallocated if outLen is 0.
>>
>> outLen can be 0 if the java output buffer was len 0 to begin with, or 
>> if the outOfs equals output array len, or if CipherFinal returns 0. 
>> In the first two cases we will call calloc(0), which on Solaris is 
>> implemented as a real calloc (returns a unique pointer which needs to 
>> be freed).
>>
>> I changed the coding to always free the internal buffers. I also 
>> removed the (bufOut != NULL) condition from SetByteArrayRegion, 
>> because that should be always true at this point.
>>
>> Kind Regards, Thomas
>>
>

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