[PATCH 5.15 03/28] orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()

From: Greg Kroah-Hartman
Date: Tue Jan 18 2022 - 11:10:02 EST


From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Mike Marshall <hubcap@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -176,7 +176,7 @@ 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);
}

@@ -226,8 +226,7 @@ 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;

@@ -250,7 +249,7 @@ 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: