lkml.org 
[lkml]   [2022]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.4 03/15] orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()
Date
From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

commit 40a74870b2d1d3d44e13b3b73c6571dd34f5614d upstream.

'buffer_index_array' really looks like a bitmap. So it should be allocated
as such.
When kzalloc is called, a number of bytes is expected, but a number of
longs is passed instead.

In get(), if not enough memory is allocated, un-allocated memory may be
read or written.

So use bitmap_zalloc() to safely allocate the correct memory size and
avoid un-expected behavior.

While at it, change the corresponding kfree() into bitmap_free() to keep
the semantic.

Fixes: ea2c9c9f6574 ("orangefs: bufmap rewrite")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/orangefs/orangefs-bufmap.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

--- a/fs/orangefs/orangefs-bufmap.c
+++ b/fs/orangefs/orangefs-bufmap.c
@@ -179,7 +179,7 @@ orangefs_bufmap_free(struct orangefs_buf
{
kfree(bufmap->page_array);
kfree(bufmap->desc_array);
- kfree(bufmap->buffer_index_array);
+ bitmap_free(bufmap->buffer_index_array);
kfree(bufmap);
}

@@ -229,8 +229,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_de
bufmap->desc_size = user_desc->size;
bufmap->desc_shift = ilog2(bufmap->desc_size);

- bufmap->buffer_index_array =
- kzalloc(DIV_ROUND_UP(bufmap->desc_count, BITS_PER_LONG), GFP_KERNEL);
+ bufmap->buffer_index_array = bitmap_zalloc(bufmap->desc_count, GFP_KERNEL);
if (!bufmap->buffer_index_array)
goto out_free_bufmap;

@@ -253,7 +252,7 @@ orangefs_bufmap_alloc(struct ORANGEFS_de
out_free_desc_array:
kfree(bufmap->desc_array);
out_free_index_array:
- kfree(bufmap->buffer_index_array);
+ bitmap_free(bufmap->buffer_index_array);
out_free_bufmap:
kfree(bufmap);
out:

\
 
 \ /
  Last update: 2022-01-18 17:07    [W:0.124 / U:0.592 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site