kexec: fix memory leak in function kimage_normal_alloc

If kimage_normal_alloc() fails to alloc pages for image->swap_page, it
should call kimage_free_page_list() to free allocated pages in
image->control_pages list before it frees image.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 855bfbbf4048699b827601c3f9e122a1f8df738c..6b7455e3c96b1478ab0690a1ff60873e672028c5 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -229,6 +229,8 @@ out:
 
 }
 
+static void kimage_free_page_list(struct list_head *list);
+
 static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
                                unsigned long nr_segments,
                                struct kexec_segment __user *segments)
@@ -252,22 +254,22 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
                                           get_order(KEXEC_CONTROL_PAGE_SIZE));
        if (!image->control_code_page) {
                printk(KERN_ERR "Could not allocate control_code_buffer\n");
-               goto out;
+               goto out_free;
        }
 
        image->swap_page = kimage_alloc_control_pages(image, 0);
        if (!image->swap_page) {
                printk(KERN_ERR "Could not allocate swap buffer\n");
-               goto out;
+               goto out_free;
        }
 
-       result = 0;
- out:
-       if (result == 0)
-               *rimage = image;
-       else
-               kfree(image);
+       *rimage = image;
+       return 0;
 
+out_free:
+       kimage_free_page_list(&image->control_pages);
+       kfree(image);
+out:
        return result;
 }