vmci: type promotion bug in qp_host_get_user_memory()

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>

diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index 9ee47244a3080ab9aae8c77aa61f14c169f018ca..bd52f29b4a4e273eb6f69a56c34a0789279d2226 100644 (file)
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -668,7 +668,7 @@ static int qp_host_get_user_memory(u64 produce_uva,
        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_debug("get_user_pages_fast(produce) failed (retval=%d)",
                        retval);
                qp_release_pages(produce_q->kernel_if->u.h.header_page,
@@ -680,7 +680,7 @@ static int qp_host_get_user_memory(u64 produce_uva,
        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_debug("get_user_pages_fast(consume) failed (retval=%d)",
                        retval);
                qp_release_pages(consume_q->kernel_if->u.h.header_page,