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dev: Hold rtnl_net_lock() for dev_ifsioc().

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Basically, dev_ifsioc() operates on the passed single netns (except
for netdev notifier chains with lower/upper devices for which we will
need more changes).

Let's hold rtnl_net_lock() for dev_ifsioc().

Now that NETDEV_CHANGENAME is always triggered under rtnl_net_lock()
of the device's netns. (do_setlink() and dev_ifsioc())

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250115095545.52709-4-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2025-01-15 18:55:45 +09:00
committed by Jakub Kicinski
parent 2f1bb1e2cc
commit be94cfdb99
3 changed files with 22 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
net/core/dev.c
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@@ -1348,16 +1348,13 @@ static int dev_get_valid_name(struct net *net, struct net_device *dev,
*/
int dev_change_name(struct net_device *dev, const char *newname)
{
struct net *net = dev_net(dev);
unsigned char old_assign_type;
char oldname[IFNAMSIZ];
int err = 0;
int ret;
struct net *net;
ASSERT_RTNL();
BUG_ON(!dev_net(dev));
net = dev_net(dev);
ASSERT_RTNL_NET(net);
if (!strncmp(newname, dev->name, IFNAMSIZ))
return 0;