* [Qemu-devel] [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl)
@ 2010-05-16 11:59 Avi Kivity
2010-05-16 13:21 ` Christoph Hellwig
2010-05-17 9:10 ` [Qemu-devel] " Kevin Wolf
0 siblings, 2 replies; 3+ messages in thread
From: Avi Kivity @ 2010-05-16 11:59 UTC (permalink / raw)
To: Kevin Wolf; +Cc: qemu-devel
Not all block format drivers expose an io_flush method (reasonable for
read-only protocols), so calling io_flush there will immediately segfault.
Fix by checking for the method's existence before calling it.
Signed-off-by: Avi Kivity <avi@redhat.com>
---
aio.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/aio.c b/aio.c
index f164a47..2f08655 100644
--- a/aio.c
+++ b/aio.c
@@ -113,7 +113,9 @@ void qemu_aio_flush(void)
qemu_aio_wait();
QLIST_FOREACH(node, &aio_handlers, node) {
- ret |= node->io_flush(node->opaque);
+ if (node->io_flush) {
+ ret |= node->io_flush(node->opaque);
+ }
}
} while (qemu_bh_poll() || ret > 0);
}
--
1.7.0.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [Qemu-devel] [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl)
2010-05-16 11:59 [Qemu-devel] [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl) Avi Kivity
@ 2010-05-16 13:21 ` Christoph Hellwig
2010-05-17 9:10 ` [Qemu-devel] " Kevin Wolf
1 sibling, 0 replies; 3+ messages in thread
From: Christoph Hellwig @ 2010-05-16 13:21 UTC (permalink / raw)
To: Avi Kivity; +Cc: Kevin Wolf, qemu-devel
On Sun, May 16, 2010 at 02:59:57PM +0300, Avi Kivity wrote:
> Not all block format drivers expose an io_flush method (reasonable for
> read-only protocols), so calling io_flush there will immediately segfault.
>
> Fix by checking for the method's existence before calling it.
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Qemu-devel] Re: [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl)
2010-05-16 11:59 [Qemu-devel] [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl) Avi Kivity
2010-05-16 13:21 ` Christoph Hellwig
@ 2010-05-17 9:10 ` Kevin Wolf
1 sibling, 0 replies; 3+ messages in thread
From: Kevin Wolf @ 2010-05-17 9:10 UTC (permalink / raw)
To: Avi Kivity; +Cc: qemu-devel
Am 16.05.2010 13:59, schrieb Avi Kivity:
> Not all block format drivers expose an io_flush method (reasonable for
> read-only protocols), so calling io_flush there will immediately segfault.
>
> Fix by checking for the method's existence before calling it.
>
> Signed-off-by: Avi Kivity <avi@redhat.com>
Thanks, applied to the block branch.
Kevin
^ permalink raw reply [flat|nested] 3+ messages in thread
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2010-05-16 11:59 [Qemu-devel] [PATCH] block: fix aio_flush segfaults for read-only protocols (e.g. curl) Avi Kivity
2010-05-16 13:21 ` Christoph Hellwig
2010-05-17 9:10 ` [Qemu-devel] " Kevin Wolf
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