[PATCH iproute2] nexthop: fix memory leak in add_nh_group_attr()

[Andrea Claudi]

grps is dinamically allocated with a calloc, and not freed in a return
path in the for cycle. This commit fix it.

While at it, make the function use a single return point.

Fixes: 63df8e8543b0 ("Add support for nexthop objects")
Signed-off-by: Andrea Claudi <acla...@redhat.com>
---
 ip/ipnexthop.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/ip/ipnexthop.c b/ip/ipnexthop.c
index 20cde586..f0658a9c 100644
--- a/ip/ipnexthop.c
+++ b/ip/ipnexthop.c
@@ -277,8 +277,9 @@ int print_nexthop(struct nlmsghdr *n, void *arg)
 
 static int add_nh_group_attr(struct nlmsghdr *n, int maxlen, char *argv)
 {
-       struct nexthop_grp *grps;
+       struct nexthop_grp *grps = NULL;
        int count = 0, i;
+       int err = -1;
        char *sep, *wsep;
 
        if (*argv != '\0')
@@ -292,11 +293,11 @@ static int add_nh_group_attr(struct nlmsghdr *n, int 
maxlen, char *argv)
        }
 
        if (count == 0)
-               return -1;
+               goto out;
 
        grps = calloc(count, sizeof(*grps));
        if (!grps)
-               return -1;
+               goto out;
 
        for (i = 0; i < count; ++i) {
                sep = strchr(argv, '/');
@@ -308,7 +309,7 @@ static int add_nh_group_attr(struct nlmsghdr *n, int 
maxlen, char *argv)
                        *wsep = '\0';
 
                if (get_unsigned(&grps[i].id, argv, 0))
-                       return -1;
+                       goto out;
                if (wsep) {
                        unsigned int w;
 
@@ -324,7 +325,10 @@ static int add_nh_group_attr(struct nlmsghdr *n, int 
maxlen, char *argv)
                argv = sep + 1;
        }
 
-       return addattr_l(n, maxlen, NHA_GROUP, grps, count * sizeof(*grps));
+       err = addattr_l(n, maxlen, NHA_GROUP, grps, count * sizeof(*grps));
+out:
+       free(grps);
+       return err;
 }
 
 static int ipnh_modify(int cmd, unsigned int flags, int argc, char **argv)
-- 
2.30.2