RFR: 8212034: Potential memory leaks in jpegLoader.c in error case

[Ambarish Rapte]

On Thu, 28 Nov 2019 11:12:42 GMT, Arunprasad Rajkumar <arajkumar at openjdk.org> wrote:

> On Wed, 27 Nov 2019 11:58:18 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:
> 
>> Memory allocated in initDecompressor() and decompressIndirect() is not freed in error case.
>> In error case,
>> 1. Allocated memory should be freed.
>> 2. Appropriate de-initialization jpeg library calls should be added.
>> 
>> Verified that,
>> 1. All unit and systems tests pass on three platforms, and
>> 2. Memory consumption with and without fix is similar by comparing memory before and after showing 10 jpeg images for 100 times.
>> 
>> ----------------
>> 
>> Commits:
>>  - 7af932b7: 8212034: Memory leaks in jpegLoader.c in error case
>> 
>> Changes: https://git.openjdk.java.net/jfx/pull/54/files
>>  Webrev: https://webrevs.openjdk.java.net/jfx/54/webrev.00
>>   Issue: https://bugs.openjdk.java.net/browse/JDK-8212034
>>   Stats: 62 lines in 1 file changed: 36 ins; 14 del; 12 mod
>>   Patch: https://git.openjdk.java.net/jfx/pull/54.diff
>>   Fetch: git fetch https://git.openjdk.java.net/jfx pull/54/head:pull/54
> 
> modules/javafx.graphics/src/main/native-iio/jpegloader.c line 1625:
> 
>> 1624: 
>> 1625:     JSAMPROW scanline_ptr = (JSAMPROW) malloc(bytes_per_row * sizeof (JSAMPLE));
>> 1626:     if (scanline_ptr == NULL) {
> 
> You can remove quite a few calls to `free` if you move the memory allocation for `scanline_ptr` just [before it's usage](https://github.com/openjdk/jfx/blob/7af932b7f5215949776ec79fb2a5484c521b21a1/modules/javafx.graphics/src/main/native-iio/jpegloader.c#L1690). Also free it as soon as you are done with it.

PR is updated according to this comment, please have a look.

PR: https://git.openjdk.java.net/jfx/pull/54