Re: [PATCH] migration/rdma: fix a memleak on error path in rdma_start_incoming_migration

[Pan Nengyuan]

Correcting zhang hailiang's email.

On 4/20/2020 6:27 PM, Pan Nengyuan wrote:
> 'rdma->host' is malloced in qemu_rdma_data_init, but forgot to free on the 
> error
> path in rdma_start_incoming_migration(), this patch fix that.
> 
> The leak stack:
> Direct leak of 2 byte(s) in 1 object(s) allocated from:
>     #0 0x7fb7add18ae8 in __interceptor_malloc (/lib64/libasan.so.5+0xefae8)
>     #1 0x7fb7ad0df1d5 in g_malloc (/lib64/libglib-2.0.so.0+0x531d5)
>     #2 0x7fb7ad0f8b32 in g_strdup (/lib64/libglib-2.0.so.0+0x6cb32)
>     #3 0x55a0464a0f6f in qemu_rdma_data_init 
> /mnt/sdb/qemu/migration/rdma.c:2647
>     #4 0x55a0464b0e76 in rdma_start_incoming_migration 
> /mnt/sdb/qemu/migration/rdma.c:4020
>     #5 0x55a0463f898a in qemu_start_incoming_migration 
> /mnt/sdb/qemu/migration/migration.c:365
>     #6 0x55a0458c75d3 in qemu_init /mnt/sdb/qemu/softmmu/vl.c:4438
>     #7 0x55a046a3d811 in main /mnt/sdb/qemu/softmmu/main.c:48
>     #8 0x7fb7a8417872 in __libc_start_main (/lib64/libc.so.6+0x23872)
>     #9 0x55a04536b26d in _start 
> (/mnt/sdb/qemu/build/x86_64-softmmu/qemu-system-x86_64+0x286926d)
> 
> Reported-by: Euler Robot <address@hidden>
> Signed-off-by: Pan Nengyuan <address@hidden>
> ---
>  migration/rdma.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/migration/rdma.c b/migration/rdma.c
> index f61587891b..967fda5b0c 100644
> --- a/migration/rdma.c
> +++ b/migration/rdma.c
> @@ -4056,6 +4056,7 @@ void rdma_start_incoming_migration(const char 
> *host_port, Error **errp)
>      return;
>  err:
>      error_propagate(errp, local_err);
> +    g_free(rdma->host);
>      g_free(rdma);
>      g_free(rdma_return_path);
>  }
>