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From: Xiao Yang <yangx.jy@fujitsu.com>
To: <linux-rdma@vger.kernel.org>
Cc: <aglo@umich.edu>, <rpearsonhpe@gmail.com>, <zyjzyj2000@gmail.com>,
	<jgg@nvidia.com>, <leon@kernel.org>,
	Xiao Yang <yangx.jy@fujitsu.com>
Subject: [PATCH] RDMA/rxe: Zero out index member of struct rxe_queue
Date: Fri, 20 Aug 2021 19:15:09 +0800	[thread overview]
Message-ID: <20210820111509.172500-1-yangx.jy@fujitsu.com> (raw)

1) New index member of struct rxe_queue is introduced but not zeroed
   so the initial value of index may be random.
2) Current index is not masked off to index_mask.
In such case, producer_addr() and consumer_addr() will get an invalid
address by the random index and then accessing the invalid address
triggers the following panic:
"BUG: unable to handle page fault for address: ffff9ae2c07a1414"

Fix the issue by using kzalloc() to zero out index member.

Fixes: 5bcf5a59c41e ("RDMA/rxe: Protext kernel index from user space")
Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
---
 drivers/infiniband/sw/rxe/rxe_queue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_queue.c b/drivers/infiniband/sw/rxe/rxe_queue.c
index 85b812586ed4..72d95398e604 100644
--- a/drivers/infiniband/sw/rxe/rxe_queue.c
+++ b/drivers/infiniband/sw/rxe/rxe_queue.c
@@ -63,7 +63,7 @@ struct rxe_queue *rxe_queue_init(struct rxe_dev *rxe, int *num_elem,
 	if (*num_elem < 0)
 		goto err1;
 
-	q = kmalloc(sizeof(*q), GFP_KERNEL);
+	q = kzalloc(sizeof(*q), GFP_KERNEL);
 	if (!q)
 		goto err1;
 
-- 
2.25.1




             reply	other threads:[~2021-08-20 10:42 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 11:15 Xiao Yang [this message]
2021-08-20 10:48 ` [PATCH] RDMA/rxe: Zero out index member of struct rxe_queue yangx.jy
2021-08-20 18:44 ` Bob Pearson
2021-08-21 13:00   ` yangx.jy
2021-08-24 18:04     ` Bob Pearson
2021-08-20 19:10 ` Jason Gunthorpe
2021-08-21  7:21 ` Zhu Yanjun
2021-08-23  4:37   ` yangx.jy
2021-08-23  5:42     ` Zhu Yanjun
2021-08-23  6:18       ` yangx.jy
2021-08-23  6:48         ` Zhu Yanjun
2021-09-01  5:42           ` yangx.jy
2021-09-01  6:03             ` Zhu Yanjun

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