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| author | Colin Ian King <colin.king@canonical.com> | 2017-11-03 11:42:02 +0300 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-11-03 18:38:27 +0300 |
| commit | 95110ac88d5139c73eef6ede37eff23c4089f4f2 (patch) | |
| tree | ce0fa7aa52ff330e56e6be4d10e2ab38c8ac0e90 /drivers/xen | |
| parent | b5494ad83fb52a8e5a7dc1d30cb42cbca5d617f1 (diff) | |
| download | linux-95110ac88d5139c73eef6ede37eff23c4089f4f2.tar.xz | |
xen/pvcalls: fix unsigned less than zero error check
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@canonical.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/pvcalls-front.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c index ed94ea0b4b8e..60a0ad81d4cf 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); |