From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: Steve Wise
<swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>,
Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Sean Hefty <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Hal Rosenstock
<hal.rosenstock-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [patch] RDMA/amso1100: integer overflow in c2_alloc_cq_buf()
Date: Thu, 17 Jul 2014 10:44:47 +0300 [thread overview]
Message-ID: <20140717074447.GA477@mwanda> (raw)
This is a static checker fix. The static checker says that q_size comes
from the user and can be any 32 bit value. The call tree is:
--> ib_uverbs_create_cq()
--> c2_create_cq()
--> c2_init_cq()
Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
diff --git a/drivers/infiniband/hw/amso1100/c2_cq.c b/drivers/infiniband/hw/amso1100/c2_cq.c
index 49e0e85..1b63185 100644
--- a/drivers/infiniband/hw/amso1100/c2_cq.c
+++ b/drivers/infiniband/hw/amso1100/c2_cq.c
@@ -260,11 +260,14 @@ static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
mq->msg_pool.host, dma_unmap_addr(mq, mapping));
}
-static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq, int q_size,
- int msg_size)
+static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq,
+ size_t q_size, size_t msg_size)
{
u8 *pool_start;
+ if (q_size > SIZE_MAX / msg_size)
+ return -EINVAL;
+
pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
&mq->host_dma, GFP_KERNEL);
if (!pool_start)
--
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reply other threads:[~2014-07-17 7:44 UTC|newest]
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