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Subject[PATCH v3] udf: Use kvzalloc() in udf_sb_alloc_bitmap()
Date
Use kvzalloc() in udf_sb_alloc_bitmap() instead of open-coding it.
Size computation wrapped in struct_size() macro to prevent potential
integer overflows.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
Changes in v2:
- size computation wrapped in struct_size()
Changes in v3:
- int size dropped

fs/udf/super.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 1c42f544096d..d9eabbe368ff 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1006,18 +1006,10 @@ int udf_compute_nr_groups(struct super_block *sb, u32 partition)
static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
{
struct udf_bitmap *bitmap;
- int nr_groups;
- int size;
-
- nr_groups = udf_compute_nr_groups(sb, index);
- size = sizeof(struct udf_bitmap) +
- (sizeof(struct buffer_head *) * nr_groups);
-
- if (size <= PAGE_SIZE)
- bitmap = kzalloc(size, GFP_KERNEL);
- else
- bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
+ int nr_groups = udf_compute_nr_groups(sb, index);

+ bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
+ GFP_KERNEL);
if (!bitmap)
return NULL;

--
2.26.2
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