From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Fri, 24 Mar 2017 11:42:05 +0000 (+0900)
Subject: smack: fix double free in smack_parse_opts_str()
X-Git-Tag: v4.12-rc1~123^2~5^2~1
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=c3c8dc9f13e2e13013822ee54a529a6fe284f1e1;p=uclinux-h8%2Flinux.git

smack: fix double free in smack_parse_opts_str()

smack_parse_opts_str() calls kfree(opts->mnt_opts) when kcalloc() for
opts->mnt_opts_flags failed. But it should not have called it because
security_free_mnt_opts() will call kfree(opts->mnt_opts).

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
fixes: 3bf2789cad9e6573 ("smack: allow mount opts setting over filesystems with binary mount data")
Cc: Vivek Trivedi <t.vivek@samsung.com>
Cc: Amit Sahrawat <a.sahrawat@samsung.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
---

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 927e60e622d1..658f5d8c7e76 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -695,10 +695,8 @@ static int smack_parse_opts_str(char *options,
 
 	opts->mnt_opts_flags = kcalloc(NUM_SMK_MNT_OPTS, sizeof(int),
 			GFP_KERNEL);
-	if (!opts->mnt_opts_flags) {
-		kfree(opts->mnt_opts);
+	if (!opts->mnt_opts_flags)
 		goto out_err;
-	}
 
 	if (fsdefault) {
 		opts->mnt_opts[num_mnt_opts] = fsdefault;