diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2023-10-23 17:23:42 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-10-24 22:02:58 +0200 |
| commit | 556c755a4d8143007c745b6ad894611a04173b53 (patch) | |
| tree | 94c4805e969db9654096e832cc05a150a7be4109 /net/core | |
| parent | net: don't use input buffer of __dev_alloc_name() as a scratch space (diff) | |
| download | linux-556c755a4d8143007c745b6ad894611a04173b53.tar.xz linux-556c755a4d8143007c745b6ad894611a04173b53.zip | |
net: make dev_alloc_name() call dev_prep_valid_name()
__dev_alloc_name() handles both the sprintf and non-sprintf
target names. This complicates the code.
dev_prep_valid_name() already handles the non-sprintf case,
before calling __dev_alloc_name(), make the only other caller
also go thru dev_prep_valid_name(). This way we can drop
the non-sprintf handling in __dev_alloc_name() in one of
the next changes.
commit 55a5ec9b7710 ("Revert "net: core: dev_get_valid_name is now the same as dev_alloc_name_ns"") and
commit 029b6d140550 ("Revert "net: core: maybe return -EEXIST in __dev_alloc_name"")
tell us that we can't start returning -EEXIST from dev_alloc_name()
on name duplicates. Bite the bullet and pass the expected errno to
dev_prep_valid_name().
dev_prep_valid_name() must now propagate out the allocated id
for printf names.
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20231023152346.3639749-3-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 874c7daa81f5..004e9f26b160 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1137,19 +1137,18 @@ static int __dev_alloc_name(struct net *net, const char *name, char *res) return -ENFILE; } +/* Returns negative errno or allocated unit id (see __dev_alloc_name()) */ static int dev_prep_valid_name(struct net *net, struct net_device *dev, - const char *want_name, char *out_name) + const char *want_name, char *out_name, + int dup_errno) { - int ret; - if (!dev_valid_name(want_name)) return -EINVAL; if (strchr(want_name, '%')) { - ret = __dev_alloc_name(net, want_name, out_name); - return ret < 0 ? ret : 0; + return __dev_alloc_name(net, want_name, out_name); } else if (netdev_name_in_use(net, want_name)) { - return -EEXIST; + return -dup_errno; } else if (out_name != want_name) { strscpy(out_name, want_name, IFNAMSIZ); } @@ -1173,14 +1172,17 @@ static int dev_prep_valid_name(struct net *net, struct net_device *dev, int dev_alloc_name(struct net_device *dev, const char *name) { - return __dev_alloc_name(dev_net(dev), name, dev->name); + return dev_prep_valid_name(dev_net(dev), dev, name, dev->name, ENFILE); } EXPORT_SYMBOL(dev_alloc_name); static int dev_get_valid_name(struct net *net, struct net_device *dev, const char *name) { - return dev_prep_valid_name(net, dev, name, dev->name); + int ret; + + ret = dev_prep_valid_name(net, dev, name, dev->name, EEXIST); + return ret < 0 ? ret : 0; } /** @@ -11118,7 +11120,7 @@ int __dev_change_net_namespace(struct net_device *dev, struct net *net, /* We get here if we can't use the current device name */ if (!pat) goto out; - err = dev_prep_valid_name(net, dev, pat, new_name); + err = dev_prep_valid_name(net, dev, pat, new_name, EEXIST); if (err < 0) goto out; } |