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: