linux/drivers/virtio
Rusty Russell bb478d8b16 virtio_ring: plug kmemleak false positive.
unreferenced object 0xffff88003d467e20 (size 32):
  comm "softirq", pid 0, jiffies 4295197765 (age 6.364s)
  hex dump (first 32 bytes):
    28 19 bf 3d 00 00 00 00 0c 00 00 00 01 00 01 00  (..=............
    02 dc 51 3c 00 00 00 00 56 00 00 00 00 00 00 00  ..Q<....V.......
  backtrace:
    [<ffffffff8152db19>] kmemleak_alloc+0x59/0xc0
    [<ffffffff81102e93>] __kmalloc+0xf3/0x180
    [<ffffffff812db5d6>] vring_add_indirect+0x36/0x280
    [<ffffffff812dc59f>] virtqueue_add_outbuf+0xbf/0x4e0
    [<ffffffff813a8b30>] start_xmit+0x1a0/0x3b0
    [<ffffffff81445861>] dev_hard_start_xmit+0x2d1/0x4d0
    [<ffffffff81460052>] sch_direct_xmit+0xf2/0x1c0
    [<ffffffff81445c28>] dev_queue_xmit+0x1c8/0x460
    [<ffffffff814e3187>] ip6_finish_output2+0x1d7/0x470
    [<ffffffff814e34b0>] ip6_finish_output+0x90/0xb0
    [<ffffffff814e3507>] ip6_output+0x37/0xb0
    [<ffffffff815021eb>] igmp6_send+0x2db/0x470
    [<ffffffff81502645>] igmp6_timer_handler+0x95/0xa0
    [<ffffffff8104b57c>] call_timer_fn+0x2c/0x90
    [<ffffffff8104b7ba>] run_timer_softirq+0x1da/0x1f0
    [<ffffffff81045721>] __do_softirq+0xd1/0x1b0

Address gets embedded in a descriptor via virt_to_phys().  See detach_buf,
which frees it:

	if (vq->vring.desc[i].flags & VRING_DESC_F_INDIRECT)
		kfree(phys_to_virt(vq->vring.desc[i].addr));

Reported-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Fix-suggested-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Typing-done-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-10-17 10:55:35 +10:30
..
config.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
Kconfig drivers/virtio: remove depends on CONFIG_EXPERIMENTAL 2013-01-11 11:39:04 -08:00
Makefile virtio: remove CONFIG_VIRTIO_RING 2012-09-28 15:05:15 +09:30
virtio_balloon.c virtio: pm: use CONFIG_PM_SLEEP instead of CONFIG_PM 2013-09-23 15:45:58 +09:30
virtio_mmio.c virtio: make config_ops const 2013-02-11 15:32:17 +10:30
virtio_pci.c virtio_pci: pm: Use CONFIG_PM_SLEEP instead of CONFIG_PM 2013-09-09 10:02:53 +09:30
virtio_ring.c virtio_ring: plug kmemleak false positive. 2013-10-17 10:55:35 +10:30
virtio.c Some nice cleanups, and even a patch my wife did as a "live" demo for 2012-12-20 08:37:05 -08:00