[Bug 752989] New: allocator: Use of uninitialised value of size 4 while using valgrind

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752989

            Bug ID: 752989
           Summary: allocator: Use of uninitialised value of size 4 while
                    using valgrind
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vineeth.tm at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When checking a mp4 file with gstvalidate using valgrind, got the below error

==18868== Thread 5 multiqueue0:src_:
==18868== Use of uninitialised value of size 4
==18868==    at 0x9D98176: decode_ics.constprop.26 (aacdec.c:1568)
==18868==    by 0x9D99356: decode_cpe (aacdec.c:1993)
==18868==    by 0x9D9B216: aac_decode_frame_int (aacdec.c:2816)
==18868==    by 0x9D9CE2C: aac_decode_frame (aacdec.c:2950)
==18868==    by 0x9C896D0: avcodec_decode_audio4 (utils.c:1657)
==18868==    by 0x98C84EC: gst_ffmpegauddec_audio_frame.isra.0
(gstavauddec.c:475)
==18868==    by 0x98C8B60: gst_ffmpegauddec_frame (gstavauddec.c:631)
==18868==    by 0x98C93A0: gst_ffmpegauddec_handle_frame (gstavauddec.c:752)
==18868==    by 0x4807F61: gst_audio_decoder_handle_frame.isra.3
(gstaudiodecoder.c:1473)
==18868==    by 0x480828A: gst_audio_decoder_push_buffers
(gstaudiodecoder.c:1571)
==18868==    by 0x480883A: gst_audio_decoder_chain_forward
(gstaudiodecoder.c:1685)
==18868==    by 0x480A6DF: gst_audio_decoder_chain (gstaudiodecoder.c:1943)
==18868==    by 0x40DE99E: gst_pad_push_data (gstpad.c:4038)
==18868==    by 0x48598D1: gst_base_parse_push_frame (gstbaseparse.c:2339)
==18868==    by 0x485AB88: gst_base_parse_chain (gstbaseparse.c:2949)
==18868==    by 0x40DE99E: gst_pad_push_data (gstpad.c:4038)
==18868==    by 0x6A899BF: gst_multi_queue_loop (gstmultiqueue.c:1237)
==18868==    by 0x41138E8: gst_task_func (gsttask.c:331)
==18868==    by 0x4114A8E: default_func (gsttaskpool.c:68)
==18868==    by 0x4273404: ??? (in /lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==18868==  Uninitialised value was created by a heap allocation
==18868==    at 0x402C17C: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==18868==    by 0x4251BE2: g_malloc (in
/lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==18868==    by 0x4268281: g_slice_alloc (in
/lib/i386-linux-gnu/libglib-2.0.so.0.4002.0)
==18868==    by 0x409B173: _sysmem_new_block (gstallocator.c:414)
==18868==    by 0x409B84A: gst_allocator_alloc (gstallocator.c:311)
==18868==    by 0x40A6D15: gst_buffer_new_allocate (gstbuffer.c:755)
==18868==    by 0x4872C08: gst_base_src_default_alloc (gstbasesrc.c:1435)
==18868==    by 0x4871B44: gst_base_src_default_create (gstbasesrc.c:1473)
==18868==    by 0x4875121: gst_base_src_get_range (gstbasesrc.c:2455)
==18868==    by 0x48776B3: gst_base_src_getrange (gstbasesrc.c:2623)
==18868==    by 0x40DF6D0: gst_pad_get_range_unchecked (gstpad.c:4477)
==18868==    by 0x40E75C4: gst_pad_pull_range (gstpad.c:4716)
==18868==    by 0x40CEA6D: gst_proxy_pad_getrange_default (gstghostpad.c:184)
==18868==    by 0x40DF6D0: gst_pad_get_range_unchecked (gstpad.c:4477)
==18868==    by 0x40E75C4: gst_pad_pull_range (gstpad.c:4716)
==18868==    by 0x6AA6B53: gst_type_find_element_getrange
(gsttypefindelement.c:988)
==18868==    by 0x40DF6D0: gst_pad_get_range_unchecked (gstpad.c:4477)
==18868==    by 0x40E75C4: gst_pad_pull_range (gstpad.c:4716)
==18868==    by 0x72CD6EC: gst_qtdemux_pull_atom (qtdemux.c:663)
==18868==    by 0x72F268C: gst_qtdemux_loop (qtdemux.c:4693)



This is happening due to allocator using g_slice_alloc.
When i use g_slice_alloc0, it does the same as g_slice_alloc and memsets it to
0, thus removing the uninitialized error.

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