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>
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@ -722,7 +722,8 @@ static int sens_destroy(void *key, void *datum, void *p)
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kfree(key);
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kfree(key);
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if (datum) {
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if (datum) {
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levdatum = datum;
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levdatum = datum;
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ebitmap_destroy(&levdatum->level->cat);
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if (levdatum->level)
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ebitmap_destroy(&levdatum->level->cat);
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kfree(levdatum->level);
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kfree(levdatum->level);
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}
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}
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kfree(datum);
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kfree(datum);
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