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xen/xen-blkback: preq.dev is used without initialized 

If call xen_vbd_translate failed, the preq.dev will be not initialized.
Use blkif->vbd.pdevice instead (still better to print relative info).

Note that before commit 01c681d4c7
(xen/blkback: Don't trust the handle from the frontend.)
the value bogus, as it was the guest provided value from req->u.rw.handle
rather than the actual device.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Chen Gang 2013-02-28 10:34:23 +08:00 committed by Konrad Rzeszutek Wilk
parent 087ffecdaa
commit a72d9002f8
1 changed files with 2 additions and 1 deletions
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3
drivers/block/xen-blkback/blkback.c
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@ -904,7 +904,8 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
pr_debug(DRV_PFX "access denied: %s of [%llu,%llu] on dev=%04x\n",
operation == READ ? "read" : "write",
preq.sector_number,
preq.sector_number + preq.nr_sects, preq.dev);
preq.sector_number + preq.nr_sects,
blkif->vbd.pdevice);
goto fail_response;
}