tree 1fdc1dd6083f759b3ca90d76ad8c47b0996d345d
parent 6621e5beab45ad7c2569fcfd1259c5b80d2a7f9e
author Alex Dewar <alex.dewar90@gmail.com> 1598373918 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1603961708 +0100

VMCI: check return value of get_user_pages_fast() for errors

[ Upstream commit 90ca6333fd65f318c47bff425e1ea36c0a5539f6 ]

In a couple of places in qp_host_get_user_memory(),
get_user_pages_fast() is called without properly checking for errors. If
e.g. -EFAULT is returned, this negative value will then be passed on to
qp_release_pages(), which expects a u64 as input.

Fix this by only calling qp_release_pages() when we have a positive
number returned.

Fixes: 06164d2b72aa ("VMCI: queue pairs implementation.")
Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
Link: https://lore.kernel.org/r/20200825164522.412392-1-alex.dewar90@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>