tree 7e34dccda32b400869ea44ba7cb1be1ec6c1e0c4
parent 999dec57f6c7d75176f981d4b5e4df8c30c1c723
author aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1238290311 +0000
committer aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> 1238290311 +0000

check for bs->drv in bdrv_flush (Christoph Hellwig)

All the bdrv_ helpers should check for bs->drv being zero as that means
there is no backend image open.  bdrv_flush fails to perform that check
and can thus cause NULL pointer dereferences.

Found using qemu-io.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6943 c046a42c-6fe2-441c-8c8c-71466251a162