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selinux: fix GPF on invalid policy 

commit 5b0e7310a2a33c06edc7eb81ffc521af9b2c5610 upstream.

levdatum->level can be NULL if we encounter an error while loading
the policy during sens_read prior to initializing it.  Make sure
sens_destroy handles that case correctly.

Reported-by: syzbot+6664500f0f18f07a5c0e@syzkaller.appspotmail.com
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Smalley 2019-01-09 10:55:10 -05:00 committed by syphyr
parent 247888cfca
commit b2c80e29e4
1 changed files with 2 additions and 1 deletions
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3
security/selinux/ss/policydb.c
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@ -722,7 +722,8 @@ static int sens_destroy(void *key, void *datum, void *p)
kfree(key);
if (datum) {
levdatum = datum;
ebitmap_destroy(&levdatum->level->cat);
if (levdatum->level)
ebitmap_destroy(&levdatum->level->cat);
kfree(levdatum->level);
}
kfree(datum);