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Re: [Libvir] plug small leaks upon failure



On Wed, Jan 30, 2008 at 04:07:32PM +0100, Jim Meyering wrote:
> with more than 20 domains, I get this:
> 
>   $ valgrind --leak-check=full ./virsh --connect test://$PWD/../docs/testnode.xml list
>   ...
>   error: failed to connect to the hypervisor
>   ...
>   ==13756== 5 bytes in 1 blocks are definitely lost in loss record 1 of 32
>   ==13756==    at 0x4A059F6: malloc (vg_replace_malloc.c:149)
>   ==13756==    by 0x387BC7CC11: strdup (strdup.c:43)
>   ==13756==    by 0x41D9F2: virXPathString (xml.c:486)
>   ==13756==    by 0x4174D3: testLoadDomain (test.c:248)
>   ==13756==    by 0x417BA4: testLoadDomainFromFile (test.c:401)
>   ==13756==    by 0x418E57: testOpenFromFile (test.c:797)
>   ==13756==    by 0x4192CE: testOpen (test.c:913)
>   ==13756==    by 0x40FA20: do_open (libvirt.c:572)
>   ==13756==    by 0x40FDE4: virConnectOpenAuth (libvirt.c:681)
>   ==13756==    by 0x40D5B1: vshInit (virsh.c:4464)
>   ==13756==    by 0x40E67C: main (virsh.c:4985)
>   ==13756==
>   ==13756==
>   ==13756== 12,996 (352 direct, 12,644 indirect) bytes in 1 blocks are definitely lost in loss record 31 of 32
>   ==13756==    at 0x4A059F6: malloc (vg_replace_malloc.c:149)
>   ==13756==    by 0x38864880E6: xmlXPathNewContext (in /usr/lib64/libxml2.so.2.6.31)
>   ==13756==    by 0x417494: testLoadDomain (test.c:242)
>   ==13756==    by 0x417BA4: testLoadDomainFromFile (test.c:401)
>   ==13756==    by 0x418E57: testOpenFromFile (test.c:797)
>   ==13756==    by 0x4192CE: testOpen (test.c:913)
>   ==13756==    by 0x40FA20: do_open (libvirt.c:572)
>   ==13756==    by 0x40FDE4: virConnectOpenAuth (libvirt.c:681)
>   ==13756==    by 0x40D5B1: vshInit (virsh.c:4464)
>   ==13756==    by 0x40E67C: main (virsh.c:4985)
>   ==13756==
>   ==13756== LEAK SUMMARY:
>   ==13756==    definitely lost: 357 bytes in 2 blocks.
>   ==13756==    indirectly lost: 12,644 bytes in 32 blocks.
>   ==13756==      possibly lost: 0 bytes in 0 blocks.
>   ==13756==    still reachable: 20,614 bytes in 362 blocks.
>   ==13756==         suppressed: 0 bytes in 0 blocks.
>   ==13756== Reachable blocks (those to which a pointer was found) are not shown.
>   ==13756== To see them, rerun with: --leak-check=full --show-reachable
> 
> Here's the fix:
> 
> 	* test.c (testLoadDomain): Avoid leaks upon failure.

ACK, to this & the other free/leak patches you've posted this morning.

Dan.
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