mirrors/zapret
1
0
Fork 0
mirror of https://github.com/bol-van/zapret.git synced 2024-12-24 07:06:36 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge pull request #113 from jwakely/patch-1

Browse Source 
Fix aliasing violations in ip6_and
This commit is contained in:
bol-van 2022-06-08 19:35:13 +03:00 committed by GitHub
commit 1fcee44443
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
ip2net/ip2net.c
View File

@ -105,16 +105,12 @@ static inline const struct in6_addr *mask_from_bitcount6(uint32_t zct)
// result = a & b
static void ip6_and(const struct in6_addr *a, const struct in6_addr *b, struct in6_addr *result)
{
// POSSIBLE GCC COMPILER BUG . when using uint64_t and -O2/-O3 optimizations this function gets inlined with the wrong code and produces wrong results
#if defined(__GNUC__) && !defined(__llvm__) && !defined(__NO_INLINE__)
((uint32_t*)result->s6_addr)[0] = ((uint32_t*)a->s6_addr)[0] & ((uint32_t*)b->s6_addr)[0];
((uint32_t*)result->s6_addr)[1] = ((uint32_t*)a->s6_addr)[1] & ((uint32_t*)b->s6_addr)[1];
((uint32_t*)result->s6_addr)[2] = ((uint32_t*)a->s6_addr)[2] & ((uint32_t*)b->s6_addr)[2];
((uint32_t*)result->s6_addr)[3] = ((uint32_t*)a->s6_addr)[3] & ((uint32_t*)b->s6_addr)[3];
#else
((uint64_t*)result->s6_addr)[0] = ((uint64_t*)a->s6_addr)[0] & ((uint64_t*)b->s6_addr)[0];
((uint64_t*)result->s6_addr)[1] = ((uint64_t*)a->s6_addr)[1] & ((uint64_t*)b->s6_addr)[1];
#endif
uint64_t a_addr[2], b_addr[2];
memcpy(a_addr, a->s6_addr, 16);
memcpy(b_addr, b->s6_addr, 16);
a_addr[0] &= b_addr[0];
a_addr[1] &= b_addr[1];
memcpy(result->s6_addr, a_addr, 16);
}
static void rtrim(char *s)