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Merge branch 'net-devname_alloc_cleanups'

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Rasmus Villemoes says:

====================
net: core: devname allocation cleanups

It's somewhat confusing to have both dev_alloc_name and
dev_get_valid_name. I can't see why the former is less strict than the
latter, so make them (or rather dev_alloc_name_ns and
dev_get_valid_name) equivalent, hardening dev_alloc_name() a little.

Obvious follow-up patches would be to only export one function, and
make dev_alloc_name a static inline wrapper for that (whichever name
is chosen for the exported interface). But maybe there is a good
reason the two exported interfaces do different checking, so I'll
refrain from including the trivial but tree-wide renaming in this
series.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-11-14 16:38:46 +09:00
commit f6b3716dcd
1 changed files with 22 additions and 40 deletions
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62
net/core/dev.c
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@ -1064,7 +1064,10 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
unsigned long *inuse;
struct net_device *d;
p = strnchr(name, IFNAMSIZ-1, '%');
if (!dev_valid_name(name))
return -EINVAL;
p = strchr(name, '%');
if (p) {
/*
* Verify the string as this thing may have come from
@ -1095,8 +1098,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
free_page((unsigned long) inuse);
}
if (buf != name)
snprintf(buf, IFNAMSIZ, name, i);
snprintf(buf, IFNAMSIZ, name, i);
if (!__dev_get_by_name(net, buf))
return i;
@ -1104,7 +1106,21 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
* when the name is long and there isn't enough space left
* for the digits, or if all bits are used.
*/
return -ENFILE;
return p ? -ENFILE : -EEXIST;
}
static int dev_alloc_name_ns(struct net *net,
struct net_device *dev,
const char *name)
{
char buf[IFNAMSIZ];
int ret;
BUG_ON(!net);
ret = __dev_alloc_name(net, name, buf);
if (ret >= 0)
strlcpy(dev->name, buf, IFNAMSIZ);
return ret;
}
/**
@ -1123,48 +1139,14 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
int dev_alloc_name(struct net_device *dev, const char *name)
{
char buf[IFNAMSIZ];
struct net *net;
int ret;
BUG_ON(!dev_net(dev));
net = dev_net(dev);
ret = __dev_alloc_name(net, name, buf);
if (ret >= 0)
strlcpy(dev->name, buf, IFNAMSIZ);
return ret;
return dev_alloc_name_ns(dev_net(dev), dev, name);
}
EXPORT_SYMBOL(dev_alloc_name);
static int dev_alloc_name_ns(struct net *net,
struct net_device *dev,
const char *name)
{
char buf[IFNAMSIZ];
int ret;
ret = __dev_alloc_name(net, name, buf);
if (ret >= 0)
strlcpy(dev->name, buf, IFNAMSIZ);
return ret;
}
int dev_get_valid_name(struct net *net, struct net_device *dev,
const char *name)
{
BUG_ON(!net);
if (!dev_valid_name(name))
return -EINVAL;
if (strchr(name, '%'))
return dev_alloc_name_ns(net, dev, name);
else if (__dev_get_by_name(net, name))
return -EEXIST;
else if (dev->name != name)
strlcpy(dev->name, name, IFNAMSIZ);
return 0;
return dev_alloc_name_ns(net, dev, name);
}
EXPORT_SYMBOL(dev_get_valid_name);