[libvirt] [PATCH] Fix invalid read in virCgroupGetValueStr

[Ján Tomko]

On 06/26/2013 03:20 PM, Peter Krempa wrote:
> On 06/26/13 15:06, Ján Tomko wrote:
>> Don't check for '\n' at the end of file if zero bytes were read.
>>
>> Found by valgrind:
>> ==404== Invalid read of size 1
>> ==404==    at 0x529B09F: virCgroupGetValueStr (vircgroup.c:540)
>> ==404==    by 0x529AF64: virCgroupMoveTask (vircgroup.c:1079)
>> ==404==    by 0x1EB475: qemuSetupCgroupForEmulator (qemu_cgroup.c:1061)
>> ==404==    by 0x1D9489: qemuProcessStart (qemu_process.c:3801)
>> ==404==    by 0x18557E: qemuDomainObjStart (qemu_driver.c:5787)
>> ==404==    by 0x190FA4: qemuDomainCreateWithFlags (qemu_driver.c:5839)
>>
>> Introduced by 0d0b409.
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=978356
>> ---
>>   src/util/vircgroup.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
> 
> ACK, the code before the optimization was immune to this problem.
> 
> Peter
> 

Actually, the commit message explicitly says 'Allow for multi-line files', so
it wasn't just an optimization.

Thanks, pushed now.

Jan