From: Leon Romanovsky <leon@kernel.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Leon Romanovsky <leonro@nvidia.com>, linux-rdma@vger.kernel.org
Subject: [PATCH rdma-next v1] RDMA/IPoIB: Fix format truncation compilation errors
Date: Thu, 9 May 2024 10:39:33 +0300 [thread overview]
Message-ID: <e9d3e1fef69df4c9beaf402cc3ac342bad680791.1715240029.git.leon@kernel.org> (raw)
From: Leon Romanovsky <leonro@nvidia.com>
Truncate the device name to store IPoIB VLAN name.
[leonro@5b4e8fba4ddd kernel]$ make -s -j 20 allmodconfig
[leonro@5b4e8fba4ddd kernel]$ make -s -j 20 W=1 drivers/infiniband/ulp/ipoib/
drivers/infiniband/ulp/ipoib/ipoib_vlan.c: In function ‘ipoib_vlan_add’:
drivers/infiniband/ulp/ipoib/ipoib_vlan.c:187:52: error: ‘%04x’
directive output may be truncated writing 4 bytes into a region of size
between 0 and 15 [-Werror=format-truncation=]
187 | snprintf(intf_name, sizeof(intf_name), "%s.%04x",
| ^~~~
drivers/infiniband/ulp/ipoib/ipoib_vlan.c:187:48: note: directive
argument in the range [0, 65535]
187 | snprintf(intf_name, sizeof(intf_name), "%s.%04x",
| ^~~~~~~~~
drivers/infiniband/ulp/ipoib/ipoib_vlan.c:187:9: note: ‘snprintf’ output
between 6 and 21 bytes into a destination of size 16
187 | snprintf(intf_name, sizeof(intf_name), "%s.%04x",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
188 | ppriv->dev->name, pkey);
| ~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[6]: *** [scripts/Makefile.build:244: drivers/infiniband/ulp/ipoib/ipoib_vlan.o] Error 1
make[6]: *** Waiting for unfinished jobs....
Fixes: 9baa0b036410 ("IB/ipoib: Add rtnl_link_ops support")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
Changelog:
v1:
* Limited device name to 10 characters to allow 16 bytes for snprintf.
---
drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 4bd161e86f8d..562df2b3ef18 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -184,8 +184,12 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
ppriv = ipoib_priv(pdev);
- snprintf(intf_name, sizeof(intf_name), "%s.%04x",
- ppriv->dev->name, pkey);
+ /* If you increase IFNAMSIZ, update snprintf below
+ * to allow longer names.
+ */
+ BUILD_BUG_ON(IFNAMSIZ != 16);
+ snprintf(intf_name, sizeof(intf_name), "%.10s.%04x", ppriv->dev->name,
+ pkey);
ndev = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
if (IS_ERR(ndev)) {
--
2.45.0
next reply other threads:[~2024-05-09 7:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 7:39 Leon Romanovsky [this message]
2024-05-12 9:42 ` [PATCH rdma-next v1] RDMA/IPoIB: Fix format truncation compilation errors Leon Romanovsky
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