diff options
| -rw-r--r-- | include/linux/compiler-gcc.h | 4 | ||||
| -rw-r--r-- | include/linux/overflow-arith.h | 18 | ||||
| -rw-r--r-- | net/ipv6/ip6_output.c | 6 |
3 files changed, 1 insertions, 27 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 82c159e..dfaa7b3 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -237,10 +237,6 @@ #define KASAN_ABI_VERSION 3 #endif -#if GCC_VERSION >= 50000 -#define CC_HAVE_BUILTIN_OVERFLOW -#endif - #endif /* gcc version >= 40000 specific checks */ #if !defined(__noclone) diff --git a/include/linux/overflow-arith.h b/include/linux/overflow-arith.h deleted file mode 100644 index e12ccf8..0000000 --- a/include/linux/overflow-arith.h +++ /dev/null @@ -1,18 +0,0 @@ -#pragma once - -#include <linux/kernel.h> - -#ifdef CC_HAVE_BUILTIN_OVERFLOW - -#define overflow_usub __builtin_usub_overflow - -#else - -static inline bool overflow_usub(unsigned int a, unsigned int b, - unsigned int *res) -{ - *res = a - b; - return *res > a ? true : false; -} - -#endif diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 8dddb45..d03d6da 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -28,7 +28,6 @@ #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> @@ -585,10 +584,7 @@ int ip6_fragment(struct sock *sk, struct sk_buff *skb, if (np->frag_size) mtu = np->frag_size; } - - if (overflow_usub(mtu, hlen + sizeof(struct frag_hdr), &mtu) || - mtu <= 7) - goto fail_toobig; + mtu -= hlen + sizeof(struct frag_hdr); frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, &ipv6_hdr(skb)->saddr); |