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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Doug Ledford <dledford@redhat.com>, Matan Barak <matanb@mellanox.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>,
	Yishai Hadas <yishaih@mellanox.com>,
	Leon Romanovsky <leon@kernel.org>,
	Shamir Rabinovitch <shamir.rabinovitch@oracle.com>,
	Michael Guralnik <michaelgur@mellanox.com>,
	Matthew Wilcox <willy@infradead.org>,
	linux-rdma@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH v2] uverbs: prevent potential underflow
Date: Fri, 11 Oct 2019 16:34:19 +0300
Message-ID: <20191011133419.GA22905@mwanda> (raw)
In-Reply-To: <20191008194425.GA28067@ziepe.ca>

The issue is in drivers/infiniband/core/uverbs_std_types_cq.c in the
UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE) function.  We check that:

        if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) {

But we don't check that "attr.comp_vector" whether negative.  It
could potentially lead to an array underflow.  My concern would be where
cq->vector is used in the create_cq() function from the cxgb4 driver.

And really "attr.comp_vector" is appears as a u32 to user space so that's
the right type to use.

Fixes: 9ee79fce3642 ("IB/core: Add completion queue (cq) object actions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: Change both types to u32

 drivers/infiniband/core/uverbs.h | 2 +-
 include/rdma/ib_verbs.h          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 1e5aeb39f774..63f7f7db5902 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -98,7 +98,7 @@ ib_uverbs_init_udata_buf_or_null(struct ib_udata *udata,
 
 struct ib_uverbs_device {
 	atomic_t				refcount;
-	int					num_comp_vectors;
+	u32					num_comp_vectors;
 	struct completion			comp;
 	struct device				dev;
 	/* First group for device attributes, NULL terminated array */
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 6a47ba85c54c..e7e733add99f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -366,7 +366,7 @@ struct ib_tm_caps {
 
 struct ib_cq_init_attr {
 	unsigned int	cqe;
-	int		comp_vector;
+	u32		comp_vector;
 	u32		flags;
 };
 
-- 
2.20.1


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-05  5:23 [PATCH] " Dan Carpenter
2019-10-08 19:44 ` Jason Gunthorpe
2019-10-09  7:35   ` Dan Carpenter
2019-10-11 13:34   ` Dan Carpenter [this message]
2019-10-22 18:15     ` [PATCH v2] " Jason Gunthorpe

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