Bug#919197: Acknowledgement (qtwayland-opensource-src: FTBFS on hppa - Segmentation faults in testsuite)

[John David Anglin <dave.anglin@bell.net>]

Looks to me to be a NULL pointer check issue in mesa:

static inline struct wl_drm_buffer *
wayland_drm_buffer_get(struct wl_drm *drm, struct wl_resource *resource)
{
        if (resource == NULL)
                return NULL;

        if (wl_resource_instance_of(resource, &wl_buffer_interface,
                                    &drm->buffer_interface))
                return wl_resource_get_user_data(resource);
        else
                return NULL;
}

(gdb) disass $pc-32-16,$pc+16
Dump of assembler code from 0xec46dd14 to 0xec46dd54:
   0xec46dd14 <dri2_query_wayland_buffer_wl+0>: stw rp,-14(sp)
   0xec46dd18 <dri2_query_wayland_buffer_wl+4>: ldo 80(sp),sp
   0xec46dd1c <dri2_query_wayland_buffer_wl+8>: ldw -b4(sp),ret0
   0xec46dd20 <dri2_query_wayland_buffer_wl+12>:        stw r5,-74(sp)
   0xec46dd24 <dri2_query_wayland_buffer_wl+16>:        copy r23,r5
   0xec46dd28 <dri2_query_wayland_buffer_wl+20>:        stw r4,-70(sp)
   0xec46dd2c <dri2_query_wayland_buffer_wl+24>:        stw r3,-6c(sp)
   0xec46dd30 <dri2_query_wayland_buffer_wl+28>:        stw r19,-20(sp)
   0xec46dd34 <dri2_query_wayland_buffer_wl+32>:        stw ret0,-78(sp)
   0xec46dd38 <dri2_query_wayland_buffer_wl+36>:        ldw 58(r25),ret0
   0xec46dd3c <dri2_query_wayland_buffer_wl+40>:        ldo c0(ret0),ret0
   0xec46dd40 <dri2_query_wayland_buffer_wl+44>:        movb,=
r24,r3,0xec46dd94 <dri2_query_wayland_buffer_wl+128>
=> 0xec46dd44 <dri2_query_wayland_buffer_wl+48>:        ldw 0(ret0),ret0
   0xec46dd48 <dri2_query_wayland_buffer_wl+52>:        addil L%800,r19,r1
   0xec46dd4c <dri2_query_wayland_buffer_wl+56>:        copy r19,r4
   0xec46dd50 <dri2_query_wayland_buffer_wl+60>:        ldw 200(r1),r25

The NULL pointer check has bee4n optimized away.

-- 
John David Anglin  dave.anglin@bell.net