linux-kernel - [PATCH] kernel/module: Use kmemdup to replace kmalloc+memcpy

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Date:   Wed, 1 Aug 2018 00:56:17 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <jeyu@...nel.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] kernel/module: Use kmemdup to replace kmalloc+memcpy

we prefer to the kmemdup rather than kmalloc+memcpy. so just
replace them.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 kernel/module.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 20344e4..6746c85 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2057,21 +2057,19 @@ static int copy_module_elf(struct module *mod, struct load_info *info)
 
 	/* Elf section header table */
 	size = sizeof(*info->sechdrs) * info->hdr->e_shnum;
-	mod->klp_info->sechdrs = kmalloc(size, GFP_KERNEL);
+	mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL);
 	if (mod->klp_info->sechdrs == NULL) {
 		ret = -ENOMEM;
 		goto free_info;
 	}
-	memcpy(mod->klp_info->sechdrs, info->sechdrs, size);
 
 	/* Elf section name string table */
 	size = info->sechdrs[info->hdr->e_shstrndx].sh_size;
-	mod->klp_info->secstrings = kmalloc(size, GFP_KERNEL);
+	mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL);
 	if (mod->klp_info->secstrings == NULL) {
 		ret = -ENOMEM;
 		goto free_sechdrs;
 	}
-	memcpy(mod->klp_info->secstrings, info->secstrings, size);
 
 	/* Elf symbol section index */
 	symndx = info->index.sym;
-- 
1.7.12.4