From 2145e15e0557a01b9195d1c7199a1b92cb9be81f Mon Sep 17 00:00:00 2001 From: Matthew Daley Date: Mon, 28 Apr 2014 19:05:21 +1200 Subject: [PATCH] floppy: don't write kernel-only members to FDRAWCMD ioctl output Do not leak kernel-only floppy_raw_cmd structure members to userspace. This includes the linked-list pointer and the pointer to the allocated DMA space. Signed-off-by: Matthew Daley Signed-off-by: Linus Torvalds --- drivers/block/floppy.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 12251a68887197..fa9bb742df6e0b 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -3067,7 +3067,10 @@ static int raw_cmd_copyout(int cmd, void __user *param, int ret; while (ptr) { - ret = copy_to_user(param, ptr, sizeof(*ptr)); + struct floppy_raw_cmd cmd = *ptr; + cmd.next = NULL; + cmd.kernel_data = NULL; + ret = copy_to_user(param, &cmd, sizeof(cmd)); if (ret) return -EFAULT; param += sizeof(struct floppy_raw_cmd);