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block: xen-blkback: add null check to avoid null pointer dereference 

Add null check before calling xen_blkif_put() to avoid potential
null pointer dereference.

Addresses-Coverity-ID: 1350942
Cc: Juergen Gross <jgross@suse.com>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Gustavo A. R. Silva 2017-05-11 10:27:35 -05:00 committed by Konrad Rzeszutek Wilk
parent 89515d0255
commit 2d4456c73a
1 changed files with 5 additions and 3 deletions
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8
drivers/block/xen-blkback/xenbus.c
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@ -504,11 +504,13 @@ static int xen_blkbk_remove(struct xenbus_device *dev)
dev_set_drvdata(&dev->dev, NULL);
if (be->blkif)
if (be->blkif) {
xen_blkif_disconnect(be->blkif);
/* Put the reference we set in xen_blkif_alloc(). */
xen_blkif_put(be->blkif);
/* Put the reference we set in xen_blkif_alloc(). */
xen_blkif_put(be->blkif);
}
kfree(be->mode);
kfree(be);
return 0;