Re: [PATCH] vl: Don't mismatch g_strsplit()/g_free()

[Pan Nengyuan <pannengyuan@huawei.com>]

On 1/10/2020 3:59 PM, Laurent Vivier wrote:
> Le 10/01/2020 à 04:16, pannengyuan@huawei.com a écrit :
>> From: Pan Nengyuan <pannengyuan@huawei.com>
>>
>> It's a mismatch between g_strsplit and g_free, it will cause a memory leak as follow:
>>
>> [root@localhost]# ./aarch64-softmmu/qemu-system-aarch64 -accel help
>> Accelerators supported in QEMU binary:
>> tcg
>> kvm
>> =================================================================
>> ==1207900==ERROR: LeakSanitizer: detected memory leaks
>>
>> Direct leak of 8 byte(s) in 2 object(s) allocated from:
>>     #0 0xfffd700231cb in __interceptor_malloc (/lib64/libasan.so.4+0xd31cb)
>>     #1 0xfffd6ec57163 in g_malloc (/lib64/libglib-2.0.so.0+0x57163)
>>     #2 0xfffd6ec724d7 in g_strndup (/lib64/libglib-2.0.so.0+0x724d7)
>>     #3 0xfffd6ec73d3f in g_strsplit (/lib64/libglib-2.0.so.0+0x73d3f)
>>     #4 0xaaab66be5077 in main /mnt/sdc/qemu-master/qemu-4.2.0-rc0/vl.c:3517
>>     #5 0xfffd6e140b9f in __libc_start_main (/lib64/libc.so.6+0x20b9f)
>>     #6 0xaaab66bf0f53  (./build/aarch64-softmmu/qemu-system-aarch64+0x8a0f53)
>>
>> Direct leak of 2 byte(s) in 2 object(s) allocated from:
>>     #0 0xfffd700231cb in __interceptor_malloc (/lib64/libasan.so.4+0xd31cb)
>>     #1 0xfffd6ec57163 in g_malloc (/lib64/libglib-2.0.so.0+0x57163)
>>     #2 0xfffd6ec7243b in g_strdup (/lib64/libglib-2.0.so.0+0x7243b)
>>     #3 0xfffd6ec73e6f in g_strsplit (/lib64/libglib-2.0.so.0+0x73e6f)
>>     #4 0xaaab66be5077 in main /mnt/sdc/qemu-master/qemu-4.2.0-rc0/vl.c:3517
>>     #5 0xfffd6e140b9f in __libc_start_main (/lib64/libc.so.6+0x20b9f)
>>     #6 0xaaab66bf0f53  (./build/aarch64-softmmu/qemu-system-aarch64+0x8a0f53)
>>
>> Reported-by: Euler Robot <euler.robot@huawei.com>
>> Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
>> ---
>>  vl.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/vl.c b/vl.c
>> index 86474a55c9..2fa5cb3b9a 100644
>> --- a/vl.c
>> +++ b/vl.c
>> @@ -3476,7 +3476,7 @@ int main(int argc, char **argv, char **envp)
>>                              gchar **optname = g_strsplit(typename,
>>                                                           ACCEL_CLASS_SUFFIX, 0);
>>                              printf("%s\n", optname[0]);
>> -                            g_free(optname);
>> +                            g_strfreev(optname);
>>                          }
>>                          g_free(typename);
>>                      }
>>
> 
> It is correct but could you try to cover all the cases?
> 
> For instance, there is another one in qga/main.c:split_list().

Ok, I will try to do it.

Thanks.

> 
> Thanks,
> Laurent
>