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authorDan Carpenter <dan.carpenter@oracle.com>2015-06-11 11:51:16 +0300
committerCasey Schaufler <casey@schaufler-ca.com>2015-06-12 11:59:11 -0700
commit5430209497eeb01415c681aaac0d00f65d24a526 (patch)
tree88bb712ff5231e78e43f9d7a4c63f2bf2d1f8be2 /security/smack/smackfs.c
parentc0d77c884461fc0dec0411e49797dc3f3651c31b (diff)
downloadlinux-5430209497eeb01415c681aaac0d00f65d24a526.tar.gz
Smack: freeing an error pointer in smk_write_revoke_subj()
This code used to rely on the fact that kfree(NULL) was a no-op, but then we changed smk_parse_smack() to return error pointers on failure instead of NULL. Calling kfree() on an error pointer will oops. I have re-arranged things a bit so that we only free things if they have been allocated. Fixes: e774ad683f42 ('smack: pass error code through pointers') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index f1c22a891b1a..5e0a64ebdf23 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -2253,8 +2253,8 @@ static const struct file_operations smk_access2_ops = {
static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- char *data = NULL;
- const char *cp = NULL;
+ char *data;
+ const char *cp;
struct smack_known *skp;
struct smack_rule *sp;
struct list_head *rule_list;
@@ -2276,18 +2276,18 @@ static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
if (copy_from_user(data, buf, count) != 0) {
rc = -EFAULT;
- goto free_out;
+ goto out_data;
}
cp = smk_parse_smack(data, count);
if (IS_ERR(cp)) {
rc = PTR_ERR(cp);
- goto free_out;
+ goto out_data;
}
skp = smk_find_entry(cp);
if (skp == NULL)
- goto free_out;
+ goto out_cp;
rule_list = &skp->smk_rules;
rule_lock = &skp->smk_rules_lock;
@@ -2299,9 +2299,11 @@ static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
mutex_unlock(rule_lock);
-free_out:
- kfree(data);
+out_cp:
kfree(cp);
+out_data:
+ kfree(data);
+
return rc;
}