libubox: Change calloc_a() to return size_t aligned pointers

Un-aligned pointers were causing seg faults on some targets

Signed-off-by: Ted Hess <thess@kitschensync.net>

diff --git a/utils.c b/utils.c
index 5d9d5aa61347b146bf713540cfa935a81fd8cd2b..765dd8bcb921b133aa320fddcada0bd3422b63e5 100644 (file)
--- a/utils.c
+++ b/utils.c
@@ -27,6 +27,9 @@
                _addr; \
                _addr = va_arg(_arg, void **), _len = _addr ? va_arg(_arg, size_t) : 0)
 
+#define C_PTR_ALIGN    (sizeof(size_t))
+#define C_PTR_MASK     (-C_PTR_ALIGN)
+
 void *__calloc_a(size_t len, ...)
 {
        va_list ap, ap1;
@@ -40,7 +43,7 @@ void *__calloc_a(size_t len, ...)
 
        va_copy(ap1, ap);
        foreach_arg(ap1, cur_addr, cur_len, &ret, len)
-               alloc_len += cur_len;
+               alloc_len += (cur_len + C_PTR_ALIGN - 1 ) & C_PTR_MASK;
        va_end(ap1);
 
        ptr = calloc(1, alloc_len);
@@ -49,7 +52,7 @@ void *__calloc_a(size_t len, ...)
        alloc_len = 0;
        foreach_arg(ap, cur_addr, cur_len, &ret, len) {
                *cur_addr = &ptr[alloc_len];
-               alloc_len += cur_len;
+               alloc_len += (cur_len + C_PTR_ALIGN - 1) & C_PTR_MASK;
        }
        va_end(ap);