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| author | Christophe JAILLET <christophe.jaillet@wanadoo.fr> | 2021-12-27 21:09:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-20 11:13:13 +0300 |
| commit | b07490067dbcce915686257b0821da44d744b682 (patch) | |
| tree | be138e117a0ab0a179560812301e0d45b10c4b44 /fs/orangefs | |
| parent | ce258c74f8d95e81ce65f53775fcdcbc8ca090da (diff) | |
| download | linux-b07490067dbcce915686257b0821da44d744b682.tar.xz | |
orangefs: Fix the size of a memory allocation in orangefs_bufmap_alloc()
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>
Diffstat (limited to 'fs/orangefs')
| -rw-r--r-- | fs/orangefs/orangefs-bufmap.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/orangefs/orangefs-bufmap.c b/fs/orangefs/orangefs-bufmap.c index 538e839590ef..b501dc07f922 100644 --- a/fs/orangefs/orangefs-bufmap.c +++ b/fs/orangefs/orangefs-bufmap.c @@ -176,7 +176,7 @@ orangefs_bufmap_free(struct orangefs_bufmap *bufmap) { 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_dev_map_desc *user_desc) 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_dev_map_desc *user_desc) 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: |