Mailing List Archive

MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in floppy code.

Also allocation buffer exactly PAGE_SIZE << MAX_ORDER bytes is okay. Fix
MAX_LEN check.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Denis Efremov <efremov@linux.com>
---
drivers/block/floppy.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 487840e3564d..90d2dfb6448e 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3079,7 +3079,7 @@ static void raw_cmd_free(struct floppy_raw_cmd **ptr)
}
}

-#define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT)
+#define MAX_LEN (1UL << (MAX_ORDER - 1) << PAGE_SHIFT)

static int raw_cmd_copyin(int cmd, void __user *param,
struct floppy_raw_cmd **rcmd)
@@ -3108,7 +3108,7 @@ static int raw_cmd_copyin(int cmd, void __user *param,
ptr->resultcode = 0;

if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
- if (ptr->length <= 0 || ptr->length >= MAX_LEN)
+ if (ptr->length <= 0 || ptr->length > MAX_LEN)
return -EINVAL;
ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
--
2.39.2