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media: v4l2-compat-ioctl32: fix several __user annotations 

Smatch report several issues with bad __user annotations:

  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:447:21: warning: incorrect type in argument 1 (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:447:21:    expected void [noderef] <asn:1>*uptr
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:447:21:    got void *<noident>
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:621:21: warning: incorrect type in argument 1 (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:621:21:    expected void const volatile [noderef] <asn:1>*<noident>
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:621:21:    got struct v4l2_plane [noderef] <asn:1>**<noident>
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:693:13: warning: incorrect type in argument 1 (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:693:13:    expected void [noderef] <asn:1>*uptr
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:693:13:    got void *[assigned] base
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:871:13: warning: incorrect type in assignment (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:871:13:    expected struct v4l2_ext_control [noderef] <asn:1>*kcontrols
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:871:13:    got struct v4l2_ext_control *<noident>
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:957:13: warning: incorrect type in assignment (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:957:13:    expected unsigned char [usertype] *__pu_val
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:957:13:    got void [noderef] <asn:1>*
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:973:13: warning: incorrect type in argument 1 (different address spaces)
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:973:13:    expected void [noderef] <asn:1>*uptr
  drivers/media/v4l2-core/v4l2-compat-ioctl32.c:973:13:    got void *[assigned] edid

Fix them.

Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2018-04-11 10:23:18 -04:00
parent 42a182282e
commit fef6cc6b36
1 changed files with 35 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/media/v4l2-core/v4l2-compat-ioctl32.c
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@ -444,7 +444,7 @@ static int put_v4l2_plane32(struct v4l2_plane __user *up,
break;
case V4L2_MEMORY_USERPTR:
if (get_user(p, &up->m.userptr) ||
put_user((compat_ulong_t)ptr_to_compat((__force void *)p),
put_user((compat_ulong_t)ptr_to_compat((void __user *)p),
&up32->m.userptr))
return -EFAULT;
break;
@ -587,7 +587,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer __user *kp,
u32 length;
enum v4l2_memory memory;
struct v4l2_plane32 __user *uplane32;
struct v4l2_plane __user *uplane;
struct v4l2_plane *uplane;
compat_caddr_t p;
int ret;
@ -617,15 +617,23 @@ static int put_v4l2_buffer32(struct v4l2_buffer __user *kp,
if (num_planes == 0)
return 0;
if (get_user(uplane, ((__force struct v4l2_plane __user **)&kp->m.planes)))
/* We need to define uplane without __user, even though
* it does point to data in userspace here. The reason is
* that v4l2-ioctl.c copies it from userspace to kernelspace,
* so its definition in videodev2.h doesn't have a
* __user markup. Defining uplane with __user causes
* smatch warnings, so instead declare it without __user
* and cast it as a userspace pointer to put_v4l2_plane32().
*/
if (get_user(uplane, &kp->m.planes))
return -EFAULT;
if (get_user(p, &up->m.planes))
return -EFAULT;
uplane32 = compat_ptr(p);
while (num_planes--) {
ret = put_v4l2_plane32(uplane, uplane32, memory);
ret = put_v4l2_plane32((void __user *)uplane,
uplane32, memory);
if (ret)
return ret;
++uplane;
@ -675,7 +683,7 @@ static int get_v4l2_framebuffer32(struct v4l2_framebuffer __user *kp,
if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
get_user(tmp, &up->base) ||
put_user((__force void *)compat_ptr(tmp), &kp->base) ||
put_user((void __force *)compat_ptr(tmp), &kp->base) ||
assign_in_user(&kp->capability, &up->capability) ||
assign_in_user(&kp->flags, &up->flags) ||
copy_in_user(&kp->fmt, &up->fmt, sizeof(kp->fmt)))
@ -690,7 +698,7 @@ static int put_v4l2_framebuffer32(struct v4l2_framebuffer __user *kp,
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
get_user(base, &kp->base) ||
put_user(ptr_to_compat(base), &up->base) ||
put_user(ptr_to_compat((void __user *)base), &up->base) ||
assign_in_user(&up->capability, &kp->capability) ||
assign_in_user(&up->flags, &kp->flags) ||
copy_in_user(&up->fmt, &kp->fmt, sizeof(kp->fmt)))
@ -857,11 +865,19 @@ static int put_v4l2_ext_controls32(struct file *file,
struct v4l2_ext_controls32 __user *up)
{
struct v4l2_ext_control32 __user *ucontrols;
struct v4l2_ext_control __user *kcontrols;
struct v4l2_ext_control *kcontrols;
u32 count;
u32 n;
compat_caddr_t p;
/*
* We need to define kcontrols without __user, even though it does
* point to data in userspace here. The reason is that v4l2-ioctl.c
* copies it from userspace to kernelspace, so its definition in
* videodev2.h doesn't have a __user markup. Defining kcontrols
* with __user causes smatch warnings, so instead declare it
* without __user and cast it as a userspace pointer where needed.
*/
if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
assign_in_user(&up->which, &kp->which) ||
get_user(count, &kp->count) ||
@ -883,10 +899,12 @@ static int put_v4l2_ext_controls32(struct file *file,
unsigned int size = sizeof(*ucontrols);
u32 id;
if (get_user(id, &kcontrols->id) ||
if (get_user(id, (unsigned int __user *)&kcontrols->id) ||
put_user(id, &ucontrols->id) ||
assign_in_user(&ucontrols->size, &kcontrols->size) ||
copy_in_user(&ucontrols->reserved2, &kcontrols->reserved2,
assign_in_user(&ucontrols->size,
(unsigned int __user *)&kcontrols->size) ||
copy_in_user(&ucontrols->reserved2,
(void __user *)&kcontrols->reserved2,
sizeof(ucontrols->reserved2)))
return -EFAULT;
@ -898,7 +916,8 @@ static int put_v4l2_ext_controls32(struct file *file,
if (ctrl_is_pointer(file, id))
size -= sizeof(ucontrols->value64);
if (copy_in_user(ucontrols, kcontrols, size))
if (copy_in_user(ucontrols,
(void __user *)kcontrols, size))
return -EFAULT;
ucontrols++;
@ -952,9 +971,10 @@ static int get_v4l2_edid32(struct v4l2_edid __user *kp,
if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
assign_in_user(&kp->pad, &up->pad) ||
assign_in_user(&kp->start_block, &up->start_block) ||
assign_in_user(&kp->blocks, &up->blocks) ||
assign_in_user(&kp->blocks,
(u32 __user *)&up->blocks) ||
get_user(tmp, &up->edid) ||
put_user(compat_ptr(tmp), &kp->edid) ||
put_user((void __force *)compat_ptr(tmp), &kp->edid) ||
copy_in_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
return -EFAULT;
return 0;
@ -970,7 +990,7 @@ static int put_v4l2_edid32(struct v4l2_edid __user *kp,
assign_in_user(&up->start_block, &kp->start_block) ||
assign_in_user(&up->blocks, &kp->blocks) ||
get_user(edid, &kp->edid) ||
put_user(ptr_to_compat(edid), &up->edid) ||
put_user(ptr_to_compat((void __user *)edid), &up->edid) ||
copy_in_user(up->reserved, kp->reserved, sizeof(up->reserved)))
return -EFAULT;
return 0;