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amdkfd: Copy from the proper user command pointer

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8f1d57c172 ("amdkfd: don't open-code memdup_user()") mistakenly uses
an uninitialized local pointer, gcc complains:

  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c: In function ‘kfd_ioctl_dbg_address_watch’:
  drivers/gpu/drm/amd/amdkfd/kfd_chardev.c:562:12: warning: ‘args_buff’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    args_buff = memdup_user(args_buff,
                ^

Fix it.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Borislav Petkov 2016-01-15 19:26:44 +01:00 • committed by Al Viro
parent e8ecde25f5
commit 39c01bf933
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
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@ -558,8 +558,7 @@ static int kfd_ioctl_dbg_address_watch(struct file *filep,
return -EINVAL; return -EINVAL;
/* this is the actual buffer to work with */ /* this is the actual buffer to work with */
args_buff = memdup_user(cmd_from_user,
args_buff = memdup_user(args_buff,
args->buf_size_in_bytes - sizeof(*args)); args->buf_size_in_bytes - sizeof(*args));
if (IS_ERR(args_buff)) if (IS_ERR(args_buff))
return PTR_ERR(args_buff); return PTR_ERR(args_buff);