From: Yan, Zheng <zyan@redhat.com>
Date: Tue, 14 Oct 2014 07:38:01 +0000 (+0800)
Subject: ceph: fix divide-by-zero in __validate_layout()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0bc62284ee3f2a228c64902ed818b6ba8e04159b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ceph: fix divide-by-zero in __validate_layout()

The 'stripe_unit' field is 64 bits, casting it to 32 bits can result zero.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
---

diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index d7dc812a2249..f851d8d70158 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -41,7 +41,7 @@ static long __validate_layout(struct ceph_mds_client *mdsc,
 	/* validate striping parameters */
 	if ((l->object_size & ~PAGE_MASK) ||
 	    (l->stripe_unit & ~PAGE_MASK) ||
-	    (l->stripe_unit != 0 &&
+	    ((unsigned)l->stripe_unit != 0 &&
 	     ((unsigned)l->object_size % (unsigned)l->stripe_unit)))
 		return -EINVAL;