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getname_flags(): clean up a bit

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-02-22 19:38:03 -05:00
parent 90a5a895cc
commit 94b5d2621a
1 changed files with 25 additions and 28 deletions
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53
fs/namei.c
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@ -124,10 +124,9 @@
struct filename *
getname_flags(const char __user *filename, int flags, int *empty)
{
struct filename *result, *err;
int len;
long max;
struct filename *result;
char *kname;
int len;
result = audit_reusename(filename);
if (result)
@ -136,7 +135,6 @@ getname_flags(const char __user *filename, int flags, int *empty)
result = __getname();
if (unlikely(!result))
return ERR_PTR(-ENOMEM);
result->refcnt = 1;
/*
* First, try to embed the struct filename inside the names_cache
@ -145,13 +143,11 @@ getname_flags(const char __user *filename, int flags, int *empty)
kname = (char *)result + sizeof(*result);
result->name = kname;
result->separate = false;
max = EMBEDDED_NAME_MAX;
recopy:
len = strncpy_from_user(kname, filename, max);
len = strncpy_from_user(kname, filename, EMBEDDED_NAME_MAX);
if (unlikely(len < 0)) {
err = ERR_PTR(len);
goto error;
__putname(result);
return ERR_PTR(len);
}
/*
@ -160,43 +156,44 @@ recopy:
* names_cache allocation for the pathname, and re-do the copy from
* userland.
*/
if (len == EMBEDDED_NAME_MAX && max == EMBEDDED_NAME_MAX) {
if (unlikely(len == EMBEDDED_NAME_MAX)) {
kname = (char *)result;
result = kzalloc(sizeof(*result), GFP_KERNEL);
if (!result) {
err = ERR_PTR(-ENOMEM);
result = (struct filename *)kname;
goto error;
if (unlikely(!result)) {
__putname(kname);
return ERR_PTR(-ENOMEM);
}
result->name = kname;
result->separate = true;
result->refcnt = 1;
max = PATH_MAX;
goto recopy;
len = strncpy_from_user(kname, filename, PATH_MAX);
if (unlikely(len < 0)) {
__putname(kname);
kfree(result);
return ERR_PTR(len);
}
if (unlikely(len == PATH_MAX)) {
__putname(kname);
kfree(result);
return ERR_PTR(-ENAMETOOLONG);
}
}
result->refcnt = 1;
/* The empty path is special. */
if (unlikely(!len)) {
if (empty)
*empty = 1;
err = ERR_PTR(-ENOENT);
if (!(flags & LOOKUP_EMPTY))
goto error;
if (!(flags & LOOKUP_EMPTY)) {
putname(result);
return ERR_PTR(-ENOENT);
}
}
err = ERR_PTR(-ENAMETOOLONG);
if (unlikely(len >= PATH_MAX))
goto error;
result->uptr = filename;
result->aname = NULL;
audit_getname(result);
return result;
error:
putname(result);
return err;
}
struct filename *