This is a note to let you know that I've just added the patch titled
RDMA/IPoIB: Fix format truncation compilation errors
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-ipoib-fix-format-truncation-compilation-errors.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2fd189c3aedf823af72a96bac4273fc69cc9d562
Author: Leon Romanovsky <leon@xxxxxxxxxx>
Date: Thu May 9 10:39:33 2024 +0300
RDMA/IPoIB: Fix format truncation compilation errors
[ Upstream commit 49ca2b2ef3d003402584c68ae7b3055ba72e750a ]
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")
Link: https://lore.kernel.org/r/e9d3e1fef69df4c9beaf402cc3ac342bad680791.1715240029.git.leon@xxxxxxxxxx
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 341753fbda54d..fed44c01d65ed 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -179,8 +179,12 @@ 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);
priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
if (!priv) {
