[PATCH 3.16 030/328] vmci: type promotion bug in qp_host_get_user_memory()

Ben Hutchings
2018-12-09T22:27:37Z

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 7fb2fd4e25fc1fb10dcb30b5519de257cfeae84c upstream.

The problem is that if get_user_pages_fast() fails and returns a
negative error code, it gets type promoted to a high positive value and
treated as a success.

Fixes: 06164d2b72aa ("VMCI: queue pairs implementation.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/misc/vmw_vmci/vmci_queue_pair.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -735,7 +735,7 @@ static int qp_host_get_user_memory(u64 p
retval = get_user_pages_fast((uintptr_t) produce_uva,
produce_q->kernel_if->num_pages, 1,
produce_q->kernel_if->u.h.header_page);
- if (retval < produce_q->kernel_if->num_pages) {
+ if (retval < (int)produce_q->kernel_if->num_pages) {
pr_warn("get_user_pages(produce) failed (retval=%d)", retval);
qp_release_pages(produce_q->kernel_if->u.h.header_page,
retval, false);
@@ -746,7 +746,7 @@ static int qp_host_get_user_memory(u64 p
retval = get_user_pages_fast((uintptr_t) consume_uva,
consume_q->kernel_if->num_pages, 1,
consume_q->kernel_if->u.h.header_page);
- if (retval < consume_q->kernel_if->num_pages) {
+ if (retval < (int)consume_q->kernel_if->num_pages) {
pr_warn("get_user_pages(consume) failed (retval=%d)", retval);
qp_release_pages(consume_q->kernel_if->u.h.header_page,
retval, false);