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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 <mattd@bugfuzz.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Daley 2014-04-28 19:05:21 +12:00 committed by Linus Torvalds
parent ef87dbe761
commit 2145e15e05
1 changed files with 4 additions and 1 deletions
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5
drivers/block/floppy.c
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@ -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);