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apparmor: Fix aa_label_build() error handling for failed merges 

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@zte.com.cn>
Signed-off-by: John Johansen <john.johansen@canonical.com>
hifive-unleashed-5.1
John Johansen 2019-01-24 13:53:05 -08:00
parent a1a02062ad
commit d6d478aee0
1 changed files with 4 additions and 1 deletions
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5
security/apparmor/domain.c
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@ -1444,7 +1444,10 @@ check:
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;