linux-kernel - [PATCH AUTOSEL 4.20 62/72] apparmor: Fix aa_label

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Message-Id: <20190223210422.199966-62-sashal@kernel.org>
Date:   Sat, 23 Feb 2019 16:04:12 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     John Johansen <john.johansen@...onical.com>,
        Sasha Levin <sashal@...nel.org>,
        linux-security-module@...r.kernel.org
Subject: [PATCH AUTOSEL 4.20 62/72] apparmor: Fix aa_label_build() error handling for failed merges

From: John Johansen <john.johansen@...onical.com>

[ Upstream commit d6d478aee003e19ef90321176552a8ad2929a47f ]

aa_label_merge() can return NULL for memory allocations failures
make sure to handle and set the correct error in this case.

Reported-by: Peng Hao <peng.hao2@....com.cn>
Signed-off-by: John Johansen <john.johansen@...onical.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/apparmor/domain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
index 08c88de0ffdad..11975ec8d5665 100644
--- a/security/apparmor/domain.c
+++ b/security/apparmor/domain.c
@@ -1444,7 +1444,10 @@ int aa_change_profile(const char *fqname, int flags)
 			new = aa_label_merge(label, target, GFP_KERNEL);
 		if (IS_ERR_OR_NULL(new)) {
 			info = "failed to build target label";
-			error = PTR_ERR(new);
+			if (!new)
+				error = -ENOMEM;
+			else
+				error = PTR_ERR(new);
 			new = NULL;
 			perms.allow = 0;
 			goto audit;
-- 
2.19.1