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dev: Acquire netdev_rename_lock before restoring dev->name in dev_change_name().

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The cited commit forgot to add netdev_rename_lock in one of the
error paths in dev_change_name().

Let's hold netdev_rename_lock before restoring the old dev->name.

Fixes: 0840556e5a ("net: Protect dev->name by seqlock.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250115095545.52709-2-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima 2025-01-15 18:55:43 +09:00 committed by Jakub Kicinski
parent 8d20dcda40
commit e361560a79
1 changed files with 2 additions and 0 deletions
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2
net/core/dev.c
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@ -1389,7 +1389,9 @@ int dev_change_name(struct net_device *dev, const char *newname)
rollback:
ret = device_rename(&dev->dev, dev->name);
if (ret) {
write_seqlock_bh(&netdev_rename_lock);
memcpy(dev->name, oldname, IFNAMSIZ);
write_sequnlock_bh(&netdev_rename_lock);
WRITE_ONCE(dev->name_assign_type, old_assign_type);
up_write(&devnet_rename_sem);
return ret;