linux-kernel - [PATCH][next] apparmor: fix memory leak on buffer on error exit path

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Message-Id: <20180327133558.13072-1-colin.king@canonical.com>
Date:   Tue, 27 Mar 2018 14:35:58 +0100
From:   Colin King <colin.king@...onical.com>
To:     John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        linux-security-module@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org,
        "Serge E . Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org
Subject: [PATCH][next] apparmor: fix memory leak on buffer on error exit path

From: Colin Ian King <colin.king@...onical.com>

Currently on the error exit path the allocated buffer is not free'd
causing a memory leak. Fix this by kfree'ing it.

Detected by CoverityScan, CID#1466876 ("Resource leaks")

Fixes: 1180b4c757aa ("apparmor: fix dangling symlinks to policy rawdata after replacement")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 security/apparmor/apparmorfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 96bb6b73af65..949dd8a48164 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -1497,8 +1497,10 @@ static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
 	}
 
 	error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
-	if (error >= size || error < 0)
+	if (error >= size || error < 0) {
+		kfree(buffer);
 		return ERR_PTR(-ENAMETOOLONG);
+	}
 
 	return buffer;
 }
-- 
2.15.1