Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes. Also, remove unnecessary
function ipv6_rpl_srh_alloc_size() and replace kzalloc() with kcalloc(),
which has a 2-factor argument form for multiplication.
This code was detected with the help of Coccinelle and, audited and
fixed manually.
Signed-off-by: Gustavo A. R. Silva
---
include/net/rpl.h | 6 --
net/ipv6/exthdrs.c | 2 +-
net/ipv6/rpl_iptunnel.c | 3 +--
3 files changed, 2 insertions(+), 9 deletions(-)
diff --git a/include/net/rpl.h b/include/net/rpl.h
index dceff60e8baf..308ef0a05cae 100644
--- a/include/net/rpl.h
+++ b/include/net/rpl.h
@@ -26,12 +26,6 @@ static inline void rpl_exit(void) {}
/* Worst decompression memory usage ipv6 address (16) + pad 7 */
#define IPV6_RPL_SRH_WORST_SWAP_SIZE (sizeof(struct in6_addr) + 7)
-static inline size_t ipv6_rpl_srh_alloc_size(unsigned char n)
-{
- return sizeof(struct ipv6_rpl_sr_hdr) +
- ((n + 1) * sizeof(struct in6_addr));
-}
-
size_t ipv6_rpl_srh_size(unsigned char n, unsigned char cmpri,
unsigned char cmpre);
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 5a8bbcdcaf2b..e9b366994475 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -580,7 +580,7 @@ static int ipv6_rpl_srh_rcv(struct sk_buff *skb)
hdr->segments_left--;
i = n - hdr->segments_left;
- buf = kzalloc(ipv6_rpl_srh_alloc_size(n + 1) * 2, GFP_ATOMIC);
+ buf = kcalloc(struct_size(hdr, segments.addr, n + 2), 2, GFP_ATOMIC);
if (unlikely(!buf)) {
kfree_skb(skb);
return -1;
diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c
index c3ececd7cfc1..5fdf3ebb953f 100644
--- a/net/ipv6/rpl_iptunnel.c
+++ b/net/ipv6/rpl_iptunnel.c
@@ -136,8 +136,7 @@ static int rpl_do_srh_inline(struct sk_buff *skb, const
struct rpl_lwt *rlwt,
oldhdr = ipv6_hdr(skb);
- buf = kzalloc(ipv6_rpl_srh_alloc_size(srh->segments_left - 1) * 2,
- GFP_ATOMIC);
+ buf = kcalloc(struct_size(srh, segments.addr, srh->segments_left), 2,
GFP_ATOMIC);
if (!buf)
return -ENOMEM;
--
2.27.0
