Re: [PATCH] cutils: fix memory leak in get_relocated_path()

[Stefano Garzarella]

Ping :-)

Should I resend for 6.1?

Thanks
Stefano

On Mon, Apr 12, 2021 at 07:02:55PM +0200, Stefano Garzarella wrote:
> get_relocated_path() allocates a GString object and returns the
> character data (C string) to the caller without freeing the memory
> allocated for that object as reported by valgrind:
>
>  24 bytes in 1 blocks are definitely lost in loss record 2,805 of 6,532
>     at 0x4839809: malloc (vg_replace_malloc.c:307)
>     by 0x55AABB8: g_malloc (in /usr/lib64/libglib-2.0.so.0.6600.8)
>     by 0x55C2481: g_slice_alloc (in /usr/lib64/libglib-2.0.so.0.6600.8)
>     by 0x55C4827: g_string_sized_new (in /usr/lib64/libglib-2.0.so.0.6600.8)
>     by 0x55C4CEA: g_string_new (in /usr/lib64/libglib-2.0.so.0.6600.8)
>     by 0x906314: get_relocated_path (cutils.c:1036)
>     by 0x6E1F77: qemu_read_default_config_file (vl.c:2122)
>     by 0x6E1F77: qemu_init (vl.c:2687)
>     by 0x3E3AF8: main (main.c:49)
>
> Let's use g_string_free(gstring, false) to free only the GString object
> and transfer the ownership of the character data to the caller.
>
> Fixes: f4f5ed2cbd ("cutils: introduce get_relocated_path")
> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
> ---
> util/cutils.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/util/cutils.c b/util/cutils.c
> index ee908486da..c9b91e7535 100644
> --- a/util/cutils.c
> +++ b/util/cutils.c
> @@ -1055,5 +1055,5 @@ char *get_relocated_path(const char *dir)
>         assert(G_IS_DIR_SEPARATOR(dir[-1]));
>         g_string_append(result, dir - 1);
>     }
> -    return result->str;
> +    return g_string_free(result, false);
> }
> --
> 2.30.2