[PATCH v2 4/6] module: sysfs: Simplify section attribute allocation

["Thomas Weißschuh" <linux@weissschuh.net>]

The existing allocation logic manually stuffs two allocations into one.
This is hard to understand and of limited value, given that all the
section names are allocated on their own anyways.
Une one allocation per datastructure.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
 kernel/module/sysfs.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/kernel/module/sysfs.c b/kernel/module/sysfs.c
index 3d507005d7111b8328c04d35476a73193f73db1c..4b1a963b712b609cde1c4375e789a6ee7f359c7a 100644
--- a/kernel/module/sysfs.c
+++ b/kernel/module/sysfs.c
@@ -58,34 +58,37 @@ static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
 
 	for (bin_attr = sect_attrs->grp.bin_attrs; *bin_attr; bin_attr++)
 		kfree((*bin_attr)->attr.name);
+	kfree(sect_attrs->grp.bin_attrs);
 	kfree(sect_attrs);
 }
 
 static int add_sect_attrs(struct module *mod, const struct load_info *info)
 {
-	unsigned int nloaded = 0, i, size[2];
 	struct module_sect_attrs *sect_attrs;
 	struct bin_attribute **gattr;
 	struct bin_attribute *sattr;
+	unsigned int nloaded = 0, i;
 	int ret;
 
 	/* Count loaded sections and allocate structures */
 	for (i = 0; i < info->hdr->e_shnum; i++)
 		if (!sect_empty(&info->sechdrs[i]))
 			nloaded++;
-	size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded),
-			sizeof(sect_attrs->grp.bin_attrs[0]));
-	size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.bin_attrs[0]);
-	sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
+	sect_attrs = kzalloc(struct_size(sect_attrs, attrs, nloaded), GFP_KERNEL);
 	if (!sect_attrs)
 		return -ENOMEM;
 
+	gattr = kcalloc(nloaded + 1, sizeof(*gattr), GFP_KERNEL);
+	if (!gattr) {
+		kfree(sect_attrs);
+		return -ENOMEM;
+	}
+
 	/* Setup section attributes. */
 	sect_attrs->grp.name = "sections";
-	sect_attrs->grp.bin_attrs = (void *)sect_attrs + size[0];
+	sect_attrs->grp.bin_attrs = gattr;
 
 	sattr = &sect_attrs->attrs[0];
-	gattr = &sect_attrs->grp.bin_attrs[0];
 	for (i = 0; i < info->hdr->e_shnum; i++) {
 		Elf_Shdr *sec = &info->sechdrs[i];
 
@@ -104,7 +107,6 @@ static int add_sect_attrs(struct module *mod, const struct load_info *info)
 		sattr->attr.mode = 0400;
 		*(gattr++) = sattr++;
 	}
-	*gattr = NULL;
 
 	ret = sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp);
 	if (ret)

-- 
2.47.1