xen/pciback: Check dev_data before using it
authorRoss Lagerwall <ross.lagerwall@citrix.com>
Fri, 14 Dec 2018 12:55:45 +0000 (12:55 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 5 Dec 2019 14:34:29 +0000 (15:34 +0100)
commitdb9bab54b5ab16bc36516e9f7c5ec3a4fee863ed
treeabac871782967791a51d9046e2d6b7df3e90a83f
parentdeddbac996ee3094ebc72a2e2f3e20cac4a5dbb4
xen/pciback: Check dev_data before using it

[ Upstream commit 1669907e3d1abfa3f7586e2d55dbbc117b5adba2 ]

If pcistub_init_device fails, the release function will be called with
dev_data set to NULL.  Check it before using it to avoid a NULL pointer
dereference.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/xen/xen-pciback/pci_stub.c