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selinux: fix double free of cond_list on error paths

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On error path from cond_read_list() and duplicate_policydb_cond_list()
the cond_list_destroy() gets called a second time in caller functions,
resulting in NULL pointer deref.  Fix this by resetting the
cond_list_len to 0 in cond_list_destroy(), making subsequent calls a
noop.

Also consistently reset the cond_list pointer to NULL after freeing.

Cc: stable@vger.kernel.org
Signed-off-by: Vratislav Bendel <vbendel@redhat.com>
[PM: fix line lengths in the description]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Vratislav Bendel 2022-02-02 12:25:11 +01:00 committed by Paul Moore
parent e783362eb5
commit 186edf7e36
1 changed files with 2 additions and 1 deletions
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3
security/selinux/ss/conditional.c
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@ -152,6 +152,8 @@ static void cond_list_destroy(struct policydb *p)
for (i = 0; i < p->cond_list_len; i++)
cond_node_destroy(&p->cond_list[i]);
kfree(p->cond_list);
p->cond_list = NULL;
p->cond_list_len = 0;
}
void cond_policydb_destroy(struct policydb *p)
@ -441,7 +443,6 @@ int cond_read_list(struct policydb *p, void *fp)
return 0;
err:
cond_list_destroy(p);
p->cond_list = NULL;
return rc;
}