kernel/sysctl.c: switch to bitmap_zalloc()

Switch to bitmap_zalloc() to show clearly what we are allocating.
Besides that it returns pointer of bitmap type instead of opaque void *.

Link: http://lkml.kernel.org/r/20190304094037.57756-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ba158f6..d82f916 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -3178,9 +3178,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
                if (IS_ERR(kbuf))
                        return PTR_ERR(kbuf);
 
-               tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
-                                    sizeof(unsigned long),
-                                    GFP_KERNEL);
+               tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
                if (!tmp_bitmap) {
                        kfree(kbuf);
                        return -ENOMEM;
@@ -3271,7 +3269,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
                *ppos += *lenp;
        }
 
-       kfree(tmp_bitmap);
+       bitmap_free(tmp_bitmap);
        return err;
 }