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Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index d03d6da772f3..8dddb45c433e 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -28,6 +28,7 @@
#include <linux/errno.h>
#include <linux/kernel.h>
+#include <linux/overflow-arith.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/net.h>
@@ -584,7 +585,10 @@ int ip6_fragment(struct sock *sk, struct sk_buff *skb,
if (np->frag_size)
mtu = np->frag_size;
}
- mtu -= hlen + sizeof(struct frag_hdr);
+
+ if (overflow_usub(mtu, hlen + sizeof(struct frag_hdr), &mtu) ||
+ mtu <= 7)
+ goto fail_toobig;
frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr);
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