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Message-Id: <1329411389-13492-1-git-send-email-xi.wang@gmail.com> Date: Thu, 16 Feb 2012 11:56:29 -0500 From: Xi Wang <xi.wang@...il.com> To: Sage Weil <sage@...dream.net> Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org, Xi Wang <xi.wang@...il.com> Subject: [PATCH] ceph: fix overflow check in build_snap_context() The overflow check for a + n * b should be (n > (ULONG_MAX - a) / b), rather than (n > ULONG_MAX / b - a). Signed-off-by: Xi Wang <xi.wang@...il.com> --- fs/ceph/snap.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index a559c80..f04c096 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -331,7 +331,7 @@ static int build_snap_context(struct ceph_snap_realm *realm) /* alloc new snap context */ err = -ENOMEM; - if (num > ULONG_MAX / sizeof(u64) - sizeof(*snapc)) + if (num > (ULONG_MAX - sizeof(*snapc)) / sizeof(u64)) goto fail; snapc = kzalloc(sizeof(*snapc) + num*sizeof(u64), GFP_NOFS); if (!snapc) -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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