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libsepol: ensure key is valid before doing search

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Signed-off-by: William Roberts <william.c.roberts@intel.com>
This commit is contained in:
William Roberts 2016-08-16 10:28:32 -07:00 committed by James Carter
parent 8b4ad4fde5
commit b612314bf3
1 changed files with 7 additions and 5 deletions
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12
libsepol/src/mls.c
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@ -262,6 +262,7 @@ int mls_context_isvalid(const policydb_t * p, const context_struct_t * c)
user_datum_t *usrdatum;
unsigned int i, l;
ebitmap_node_t *cnode;
hashtab_key_t key;
if (!p->mls)
return 1;
@ -279,11 +280,12 @@ int mls_context_isvalid(const policydb_t * p, const context_struct_t * c)
if (!c->range.level[l].sens
|| c->range.level[l].sens > p->p_levels.nprim)
return 0;
levdatum = (level_datum_t *) hashtab_search(p->p_levels.table,
p->
p_sens_val_to_name
[c->range.level[l].
sens - 1]);
key = p->p_sens_val_to_name[c->range.level[l].sens - 1];
if (!key)
return 0;
levdatum = (level_datum_t *) hashtab_search(p->p_levels.table, key);
if (!levdatum)
return 0;