From: Gustavo A. R. Silva Date: Thu, 11 May 2017 15:27:35 +0000 (-0500) Subject: block: xen-blkback: add null check to avoid null pointer dereference X-Git-Tag: v4.12-rc2~7^2~8^2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2d4456c73a487abe53863e10641c2f73537edf5c;p=karo-tx-linux.git 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 Signed-off-by: Gustavo A. R. Silva Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index 8fe61b5dc5a6..1f3dfaa54d87 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -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;