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smack: fix logic in smack_inode_init_security function

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In principle if this function was called with "value" == NULL and "len"
not NULL it could return different results for the "len" compared to a
case where "name" was not NULL. This is a hypothetical case that does
not exist in the kernel, but it's a logic bug nonetheless.

Signed-off-by: Lukasz Pawelczyk <l.pawelczyk@samsung.com>
This commit is contained in:
Lukasz Pawelczyk 2014-11-26 15:31:07 +01:00 committed by Casey Schaufler
parent 1a28979b32
commit 68390ccf8b
1 changed files with 2 additions and 3 deletions
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5
security/smack/smack_lsm.c
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@ -800,7 +800,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
if (name)
*name = XATTR_SMACK_SUFFIX;
if (value) {
if (value && len) {
rcu_read_lock();
may = smk_access_entry(skp->smk_known, dsp->smk_known,
&skp->smk_rules);
@ -821,10 +821,9 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
*value = kstrdup(isp->smk_known, GFP_NOFS);
if (*value == NULL)
return -ENOMEM;
}
if (len)
*len = strlen(isp->smk_known);
}
return 0;
}