The following Coccinelle script was used to detect this:
@r@
expression x;
void* e;
type T;
identifier f;
@@
(
  *((T *)e)
|
  ((T *)x)[...]
|
  ((T*)x)->f
|

- (T*)
  e
)

Signed-off-by: Arushi Singhal <arushisinghal19971...@gmail.com>
---
 iptables/nft-arp.c     |  4 ++--
 iptables/xtables-arp.c | 12 ++++++------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/iptables/nft-arp.c b/iptables/nft-arp.c
index 0e13b8c..335963c 100644
--- a/iptables/nft-arp.c
+++ b/iptables/nft-arp.c
@@ -62,7 +62,7 @@ addr_to_host(const struct in_addr *addr)
                                        sizeof(struct in_addr), AF_INET)) != 
NULL)
                return (char *) host->h_name;
 
-       return (char *) NULL;
+       return NULL;
 }
 
 static char *
@@ -73,7 +73,7 @@ addr_to_network(const struct in_addr *addr)
        if ((net = getnetbyaddr((long) ntohl(addr->s_addr), AF_INET)) != NULL)
                return (char *) net->n_name;
 
-       return (char *) NULL;
+       return NULL;
 }
 
 static char *
diff --git a/iptables/xtables-arp.c b/iptables/xtables-arp.c
index 85feb48..d346d3e 100644
--- a/iptables/xtables-arp.c
+++ b/iptables/xtables-arp.c
@@ -361,11 +361,11 @@ dotted_to_addr(const char *dotted)
        p = buf;
        for (i = 0; i < 3; i++) {
                if ((q = strchr(p, '.')) == NULL)
-                       return (struct in_addr *) NULL;
+                       return NULL;
 
                *q = '\0';
                if (string_to_number(p, 0, 255, &onebyte) == -1)
-                       return (struct in_addr *) NULL;
+                       return NULL;
 
                addrp[i] = (unsigned char) onebyte;
                p = q + 1;
@@ -373,7 +373,7 @@ dotted_to_addr(const char *dotted)
 
        /* we've checked 3 bytes, now we check the last one */
        if (string_to_number(p, 0, 255, &onebyte) == -1)
-               return (struct in_addr *) NULL;
+               return NULL;
 
        addrp[3] = (unsigned char) onebyte;
 
@@ -388,12 +388,12 @@ network_to_addr(const char *name)
 
        if ((net = getnetbyname(name)) != NULL) {
                if (net->n_addrtype != AF_INET)
-                       return (struct in_addr *) NULL;
+                       return NULL;
                addr.s_addr = htonl((unsigned long) net->n_net);
                return &addr;
        }
 
-       return (struct in_addr *) NULL;
+       return NULL;
 }
 
 static void
@@ -614,7 +614,7 @@ host_to_addr(const char *name, unsigned int *naddr)
                return addr;
        }
 
-       return (struct in_addr *) NULL;
+       return NULL;
 }
 
 /*
-- 
2.11.0

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