From: Ted Hess <thess@kitschensync.net>
Date: Thu, 23 Feb 2017 20:57:02 +0000 (-0500)
Subject: libubox: Change calloc_a() to return size_t aligned pointers
X-Git-Url: http://git.openwrt.org/?p=project%2Flibubox.git;a=commitdiff_plain;h=96305a3cafcc9c0df7f189567671bb26ce3eb129

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 5d9d5aa..765dd8b 100644
--- 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);