netdev - [PATCH 2/5] drivers/net/brocade-bnad: ensure the copied buf is NULL terminated

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Message-Id: <20240422-fix-oob-read-v1-2-e02854c30174@gmail.com>
Date: Mon, 22 Apr 2024 23:41:37 +0700
From: Bui Quang Minh <minhquangbui99@...il.com>
To: Jesse Brandeburg <jesse.brandeburg@...el.com>, 
 Tony Nguyen <anthony.l.nguyen@...el.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Paul M Stillwell Jr <paul.m.stillwell.jr@...el.com>, 
 Rasesh Mody <rmody@...vell.com>, Sudarsana Kalluru <skalluru@...vell.com>, 
 GR-Linux-NIC-Dev@...vell.com, Krishna Gudipati <kgudipat@...cade.com>, 
 Anil Gurumurthy <anil.gurumurthy@...gic.com>, 
 Sudarsana Kalluru <sudarsana.kalluru@...gic.com>, 
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, 
 "Martin K. Petersen" <martin.petersen@...cle.com>, 
 Fabian Frederick <fabf@...net.be>, Saurav Kashyap <skashyap@...vell.com>, 
 Javed Hasan <jhasan@...vell.com>, GR-QLogic-Storage-Upstream@...vell.com, 
 Nilesh Javali <nilesh.javali@...ium.com>, Arun Easi <arun.easi@...ium.com>, 
 Manish Rangankar <manish.rangankar@...ium.com>, 
 Vineeth Vijayan <vneethv@...ux.ibm.com>, 
 Peter Oberparleiter <oberpar@...ux.ibm.com>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org, 
 Saurav Kashyap <saurav.kashyap@...ium.com>, linux-s390@...r.kernel.org, 
 Jens Axboe <axboe@...nel.dk>, Bui Quang Minh <minhquangbui99@...il.com>
Subject: [PATCH 2/5] drivers/net/brocade-bnad: ensure the copied buf is
 NULL terminated

Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from
userspace to that buffer. Later, we use sscanf on this buffer but we don't
ensure that the string is terminated inside the buffer, this can lead to
OOB read when using sscanf. Fix this issue by using memdup_user_nul
instead of memdup_user.

Fixes: 7afc5dbde091 ("bna: Add debugfs interface.")
Signed-off-by: Bui Quang Minh <minhquangbui99@...il.com>
---
 drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
index 7246e13dd559..97291bfbeea5 100644
--- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
@@ -312,7 +312,7 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
 	void *kern_buf;

 	/* Copy the user space buf */
-	kern_buf = memdup_user(buf, nbytes);
+	kern_buf = memdup_user_nul(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

@@ -372,7 +372,7 @@ bnad_debugfs_write_regwr(struct file *file, const char __user *buf,
 	void *kern_buf;

 	/* Copy the user space buf */
-	kern_buf = memdup_user(buf, nbytes);
+	kern_buf = memdup_user_nul(buf, nbytes);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);

-- 
2.34.1