[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH for-3.1] vfio-helpers: Fix qemu_vfio_open_pci() cras
From: |
Markus Armbruster |
Subject: |
[Qemu-devel] [PATCH for-3.1] vfio-helpers: Fix qemu_vfio_open_pci() crash |
Date: |
Tue, 27 Nov 2018 09:41:43 +0100 |
qemu_vfio_open_common() initializes s->lock only after passing s to
qemu_vfio_dma_map() via qemu_vfio_init_ramblock().
qemu_vfio_dma_map() tries to lock the uninitialized lock and crashes.
Fix by initializing s->lock first.
RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1645840
Fixes: 418026ca43bc2626db092d7558258f9594366f28
Cc: address@hidden
Signed-off-by: Markus Armbruster <address@hidden>
---
Compile-tested only, as I lack suitable hardware. Cong Li (cc'ed) is
going to test it for real. It looks obvious enough to me to put it
into -rc3 without waiting for the test results. We can also wait and
put it into -rc4.
util/vfio-helpers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index 1d9272efa4..cccc9cd42e 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -411,13 +411,13 @@ static int qemu_vfio_init_ramblock(const char
*block_name, void *host_addr,
static void qemu_vfio_open_common(QEMUVFIOState *s)
{
+ qemu_mutex_init(&s->lock);
s->ram_notifier.ram_block_added = qemu_vfio_ram_block_added;
s->ram_notifier.ram_block_removed = qemu_vfio_ram_block_removed;
ram_block_notifier_add(&s->ram_notifier);
s->low_water_mark = QEMU_VFIO_IOVA_MIN;
s->high_water_mark = QEMU_VFIO_IOVA_MAX;
qemu_ram_foreach_block(qemu_vfio_init_ramblock, s);
- qemu_mutex_init(&s->lock);
}
/**
--
2.17.2
- [Qemu-devel] [PATCH for-3.1] vfio-helpers: Fix qemu_vfio_open_pci() crash,
Markus Armbruster <=