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smack: opt_dentry is never null in in smack_d_instantiate()

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This patch removes some unneeded code for if opt_dentry is null because
that can never happen.

The function dereferences "opt_dentry" earlier when it checks
"if (opt_dentry->d_parent == opt_dentry) {".  That code was added in
2008.

This function called from security_d_instantiate().  I checked all the
places which call security_d_instantiate() and dentry is always non-null.
I also checked the selinux version of this hook and there is a comment
which says that dentry should be non-null if called from
d_instantiate().

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Dan Carpenter 2010-06-01 09:14:04 +02:00 committed by James Morris
parent c3ef1500ec
commit 3e62cbb843
1 changed files with 2 additions and 12 deletions
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14
security/smack/smack_lsm.c
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@ -2191,7 +2191,7 @@ static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
/**
* smack_d_instantiate - Make sure the blob is correct on an inode
* @opt_dentry: unused
* @opt_dentry: dentry where inode will be attached
* @inode: the object
*
* Set the inode's security blob if it hasn't been done already.
@ -2310,20 +2310,10 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
/*
* Get the dentry for xattr.
*/
if (opt_dentry == NULL) {
dp = d_find_alias(inode);
if (dp == NULL)
break;
} else {
dp = dget(opt_dentry);
if (dp == NULL)
break;
}
dp = dget(opt_dentry);
fetched = smk_fetch(inode, dp);
if (fetched != NULL)
final = fetched;
dput(dp);
break;
}