[PATCH AUTOSEL 4.20 62/72] apparmor: Fix aa_label_build() error handling for failed merges

[Sasha Levin]

From: John Johansen <john.johansen at canonical.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 at zte.com.cn>
Signed-off-by: John Johansen <john.johansen at canonical.com>
Signed-off-by: Sasha Levin <sashal at kernel.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