Re: [PATCH v2 2/2] ui/vdagent: fix clipboard info memory leak in error path

[Philippe Mathieu-Daudé]

On 6/1/21 5:57 PM, Stefan Hajnoczi wrote:
> If the size of a VD_AGENT_CLIPBOARD_GRAB message is invalid we leak info
> when returning early.
> 
> Thanks to Coverity for spotting this:
> 
> *** CID 1453266:  Resource leaks  (RESOURCE_LEAK)
> /qemu/ui/vdagent.c: 465 in vdagent_chr_recv_clipboard()
> 459             info = qemu_clipboard_info_new(&vd->cbpeer, s);
> 460             if (size > sizeof(uint32_t) * 10) {
> 461                 /*
> 462                  * spice has 6 types as of 2021. Limiting to 10 entries
> 463                  * so we we have some wiggle room.
> 464                  */
>>>>     CID 1453266:  Resource leaks  (RESOURCE_LEAK)
>>>>     Variable "info" going out of scope leaks the storage it points to.
> 465                 return;
> 466             }
> 467             while (size >= sizeof(uint32_t)) {
> 468                 trace_vdagent_cb_grab_type(GET_NAME(type_name, *(uint32_t 
> *)data));
> 469                 switch (*(uint32_t *)data) {
> 470                 case VD_AGENT_CLIPBOARD_UTF8_TEXT:
> 
> Fixes: f0349f4d8947ad32d0fa4678cbf5dbb356fcbda1 ("ui/vdagent: add clipboard 
> support")
> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  ui/vdagent.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>