netdev - [PATCH net v4] s390/iucv: Fix vargs handling in iucv_alloc

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Message-ID: <20240821091337.3627068-1-wintera@linux.ibm.com>
Date: Wed, 21 Aug 2024 11:13:37 +0200
From: Alexandra Winter <wintera@...ux.ibm.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        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>,
        Thorsten Winkler <twinkler@...ux.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Przemek Kitszel <przemyslaw.kitszel@...el.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH net v4] s390/iucv: Fix vargs handling in iucv_alloc_device()

iucv_alloc_device() gets a format string and a varying number of
arguments. This is incorrectly forwarded by calling dev_set_name() with
the format string and a va_list, while dev_set_name() expects also a
varying number of arguments.

Symptoms:
Corrupted iucv device names, which can result in log messages like:
sysfs: cannot create duplicate filename '/devices/iucv/hvc_iucv1827699952'

Fixes: 4452e8ef8c36 ("s390/iucv: Provide iucv_alloc_device() / iucv_release_device()")
Link: https://bugzilla.suse.com/show_bug.cgi?id=1228425
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
Reviewed-by: Thorsten Winkler <twinkler@...ux.ibm.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
---
v3 -> v4: Remove reference to internal bugzilla
v2 -> v3: use %s (Przemek Kitszel)
Discussion of v1:
Link: https://lore.kernel.org/all/2024081326-shifter-output-cb8f@gregkh/T/#mf8ae979de8acdc01f7ede0b94af6f2e110eea209
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202408091131.ATGn6YSh-lkp@intel.com/
Vasily Gorbik asked me to send this version via the netdev mailing list.
---
 net/iucv/iucv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index 1e42e13ad24e..d3e9efab7f4b 100644
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -86,13 +86,15 @@ struct device *iucv_alloc_device(const struct attribute_group **attrs,
 {
 	struct device *dev;
 	va_list vargs;
+	char buf[20];
 	int rc;
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		goto out_error;
 	va_start(vargs, fmt);
-	rc = dev_set_name(dev, fmt, vargs);
+	vsnprintf(buf, sizeof(buf), fmt, vargs);
+	rc = dev_set_name(dev, "%s", buf);
 	va_end(vargs);
 	if (rc)
 		goto out_error;
-- 
2.43.0