From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
The check on bedata->ref is never true because ref is an unsigned
integer. Fix this by assigning signed int ret to the return of the
call to gnttab_claim_grant_reference so the -ve return can be checked.
Detected by CoverityScan, CID#1460358 ("Unsigned compared against 0")
Fixes: 219681909913 ("xen/pvcalls: connect to the backend")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
drivers/xen/pvcalls-front.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 0c1ec6894cc4..de8a470351a5 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -1186,11 +1186,10 @@ static int pvcalls_front_probe(struct xenbus_device *dev,
ret = gnttab_alloc_grant_references(1, &gref_head);
if (ret < 0)
goto error;
- bedata->ref = gnttab_claim_grant_reference(&gref_head);
- if (bedata->ref < 0) {
- ret = bedata->ref;
+ ret = gnttab_claim_grant_reference(&gref_head);
+ if (ret < 0)
goto error;
- }
+ bedata->ref = ret;
gnttab_grant_foreign_access_ref(bedata->ref, dev->otherend_id,
virt_to_gfn((void *)sring), 0);
--
2.14.1
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