[nft PATCH 04/12] segtree: Fix memory leaks

[Phil Sutter]

This fixes memory leaks in three places:

* set_overlap():

The allocated intervals have to be freed again before returning to
caller. While being at it, reduce indenting level in said function to
stay below 80 columns boundary.

* range_is_prefix():
* interval_map_decompose():

GMP documentation suggests to call mpz_clear() for all mpz_t type
variables once they are not used anymore to free the space they occupy.

Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 src/segtree.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/src/segtree.c b/src/segtree.c
index f8d62d7a24ce4..1970265a9f11c 100644
--- a/src/segtree.c
+++ b/src/segtree.c
@@ -359,20 +359,29 @@ static int set_overlap(struct list_head *msgs, const 
struct set *set,
        struct elementary_interval *new_intervals[init->size];
        struct elementary_interval *intervals[set->init->size];
        unsigned int n, m, i, j;
+       int ret = 0;
 
        n = expr_to_intervals(init, keylen, new_intervals);
        m = expr_to_intervals(set->init, keylen, intervals);
 
        for (i = 0; i < n; i++) {
                for (j = 0; j < m; j++) {
-                       if (interval_overlap(new_intervals[i], intervals[j]))
-                               return expr_error(msgs,
-                                       new_intervals[i]->expr,
-                                       "interval overlaps with an existing 
one");
+                       if (!interval_overlap(new_intervals[i], intervals[j]))
+                               continue;
+
+                       expr_error(msgs, new_intervals[i]->expr,
+                                  "interval overlaps with an existing one");
+                       ret = -1;
+                       goto out;
                }
        }
+out:
+       for (i = 0; i < n; i++)
+               ei_destroy(new_intervals[i]);
+       for (i = 0; i < m; i++)
+               ei_destroy(intervals[i]);
 
-       return 0;
+       return ret;
 }
 
 static int set_to_segtree(struct list_head *msgs, struct set *set,
@@ -695,11 +704,14 @@ void get_set_decompose(struct table *table, struct set 
*set)
 static bool range_is_prefix(const mpz_t range)
 {
        mpz_t tmp;
+       bool ret;
 
        mpz_init_set(tmp, range);
        mpz_add_ui(tmp, tmp, 1);
        mpz_and(tmp, range, tmp);
-       return !mpz_cmp_ui(tmp, 0);
+       ret = !mpz_cmp_ui(tmp, 0);
+       mpz_clear(tmp);
+       return ret;
 }
 
 static struct expr *expr_value(struct expr *expr)
@@ -860,6 +872,9 @@ void interval_map_decompose(struct expr *set)
                compound_expr_add(set, i);
        }
 
+       mpz_clear(range);
+       mpz_clear(p);
+
        xfree(ranges);
        xfree(elements);
 }
-- 
2.16.1

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