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authorMarc-Antoine Perennou <Marc-Antoine@Perennou.com>2014-06-22 19:36:03 +0900
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-06-22 12:26:09 -0400
commit57827c087c3d32920136842f242bf4183cbfcb35 (patch)
treef22b3fc676b64f7598de8bb03de79d2b41158263 /src
parent026d00bc4a5f72e5541645eccf8f90761f8f1dfd (diff)
fix in_addr_prefix_intersect for 32bits
shifting from a non fixed number of bits >= to the size of the type leads to weird results, handle the special case of << 32 to fix it. This was causing a test failure from test-socket-util: Assertion 'in_addr_prefix_intersect(f, &ua, apl, &ub, bpl) == result' failed at /var/tmp/paludis/build/sys-apps-systemd-scm/work/systemd-scm/src/test/test-socket-util.c:147, function test_in_addr_prefix_intersect_one(). Aborting. Minimal reproducer: paludisbuild@Lou /tmp $ cat test.c static void test(unsigned m) { unsigned nm = 0xFFFFFFFFUL << (32-m); printf("%u: %x\n", m, nm); } int main (void) { test(1); test(0); return 0; } paludisbuild@Lou /tmp $ gcc -m32 -std=gnu99 test.c -o test32 paludisbuild@Lou /tmp $ ./test32 1: 80000000 0: ffffffff paludisbuild@Lou /tmp $ gcc -std=gnu99 test.c -o test64 paludisbuild@Lou /tmp $ ./test64 1: 80000000 0: 0
Diffstat (limited to 'src')
-rw-r--r--src/shared/socket-util.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index f8c6795e7c..6f4979853e 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -695,7 +695,7 @@ int in_addr_prefix_intersect(
uint32_t x, nm;
x = be32toh(a->in.s_addr ^ b->in.s_addr);
- nm = 0xFFFFFFFFUL << (32 - m);
+ nm = (m == 0) ? 0 : 0xFFFFFFFFUL << (32 - m);
return (x & nm) == 0;
}