From: Hans Verkuil <hans.verk...@cisco.com>

commit 333b1e9f96ce05f7498b581509bb30cde03018bf upstream.

Instead of doing sizeof(struct foo) use sizeof(*up). There even were
cases where 4 * sizeof(__u32) was used instead of sizeof(kp->reserved),
which is very dangerous when the size of the reserved array changes.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Acked-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 77 +++++++++++++--------------
 1 file changed, 36 insertions(+), 41 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c 
b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 5ebc11476f63..ace1d7b050a5 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -47,7 +47,7 @@ struct v4l2_window32 {
 
 static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 
__user *up)
 {
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_window32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            copy_from_user(&kp->w, &up->w, sizeof(up->w)) ||
            get_user(kp->field, &up->field) ||
            get_user(kp->chromakey, &up->chromakey) ||
@@ -64,7 +64,7 @@ static int get_v4l2_window32(struct v4l2_window *kp, struct 
v4l2_window32 __user
                if (get_user(p, &up->clips))
                        return -EFAULT;
                uclips = compat_ptr(p);
-               kclips = compat_alloc_user_space(n * sizeof(struct v4l2_clip));
+               kclips = compat_alloc_user_space(n * sizeof(*kclips));
                kp->clips = kclips;
                while (--n >= 0) {
                        if (copy_in_user(&kclips->c, &uclips->c, 
sizeof(uclips->c)))
@@ -157,14 +157,14 @@ static int __get_v4l2_format32(struct v4l2_format *kp, 
struct v4l2_format32 __us
 
 static int get_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 
__user *up)
 {
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_format32)))
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)))
                return -EFAULT;
        return __get_v4l2_format32(kp, up);
 }
 
 static int get_v4l2_create32(struct v4l2_create_buffers *kp, struct 
v4l2_create_buffers32 __user *up)
 {
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_create_buffers32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            copy_from_user(kp, up, offsetof(struct v4l2_create_buffers32, 
format)))
                return -EFAULT;
        return __get_v4l2_format32(&kp->format, &up->format);
@@ -208,14 +208,14 @@ static int __put_v4l2_format32(struct v4l2_format *kp, 
struct v4l2_format32 __us
 
 static int put_v4l2_format32(struct v4l2_format *kp, struct v4l2_format32 
__user *up)
 {
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_format32)))
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
                return -EFAULT;
        return __put_v4l2_format32(kp, up);
 }
 
 static int put_v4l2_create32(struct v4l2_create_buffers *kp, struct 
v4l2_create_buffers32 __user *up)
 {
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_create_buffers32)) 
||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            copy_to_user(up, kp, offsetof(struct v4l2_create_buffers32, 
format)) ||
            copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
                return -EFAULT;
@@ -234,7 +234,7 @@ struct v4l2_standard32 {
 static int get_v4l2_standard32(struct v4l2_standard *kp, struct 
v4l2_standard32 __user *up)
 {
        /* other fields are not set by the user, nor used by the driver */
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_standard32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            get_user(kp->index, &up->index))
                return -EFAULT;
        return 0;
@@ -242,13 +242,13 @@ static int get_v4l2_standard32(struct v4l2_standard *kp, 
struct v4l2_standard32
 
 static int put_v4l2_standard32(struct v4l2_standard *kp, struct 
v4l2_standard32 __user *up)
 {
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_standard32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(kp->index, &up->index) ||
            put_user(kp->id, &up->id) ||
-           copy_to_user(up->name, kp->name, 24) ||
+           copy_to_user(up->name, kp->name, sizeof(up->name)) ||
            copy_to_user(&up->frameperiod, &kp->frameperiod, 
sizeof(kp->frameperiod)) ||
            put_user(kp->framelines, &up->framelines) ||
-           copy_to_user(up->reserved, kp->reserved, 4 * sizeof(__u32)))
+           copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
                return -EFAULT;
        return 0;
 }
@@ -296,7 +296,7 @@ static int get_v4l2_plane32(struct v4l2_plane __user *up, 
struct v4l2_plane32 __
 
        if (copy_in_user(up, up32, 2 * sizeof(__u32)) ||
            copy_in_user(&up->data_offset, &up32->data_offset,
-                        sizeof(__u32)))
+                        sizeof(up->data_offset)))
                return -EFAULT;
 
        if (memory == V4L2_MEMORY_USERPTR) {
@@ -306,11 +306,11 @@ static int get_v4l2_plane32(struct v4l2_plane __user *up, 
struct v4l2_plane32 __
                if (put_user((unsigned long)up_pln, &up->m.userptr))
                        return -EFAULT;
        } else if (memory == V4L2_MEMORY_DMABUF) {
-               if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(int)))
+               if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(up32->m.fd)))
                        return -EFAULT;
        } else {
                if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
-                                sizeof(__u32)))
+                                sizeof(up32->m.mem_offset)))
                        return -EFAULT;
        }
 
@@ -322,19 +322,19 @@ static int put_v4l2_plane32(struct v4l2_plane __user *up, 
struct v4l2_plane32 __
 {
        if (copy_in_user(up32, up, 2 * sizeof(__u32)) ||
            copy_in_user(&up32->data_offset, &up->data_offset,
-                        sizeof(__u32)))
+                        sizeof(up->data_offset)))
                return -EFAULT;
 
        /* For MMAP, driver might've set up the offset, so copy it back.
         * USERPTR stays the same (was userspace-provided), so no copying. */
        if (memory == V4L2_MEMORY_MMAP)
                if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
-                                sizeof(__u32)))
+                                sizeof(up->m.mem_offset)))
                        return -EFAULT;
        /* For DMABUF, driver might've set up the fd, so copy it back. */
        if (memory == V4L2_MEMORY_DMABUF)
                if (copy_in_user(&up32->m.fd, &up->m.fd,
-                                sizeof(int)))
+                                sizeof(up->m.fd)))
                        return -EFAULT;
 
        return 0;
@@ -348,7 +348,7 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct 
v4l2_buffer32 __user
        int num_planes;
        int ret;
 
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_buffer32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            get_user(kp->index, &up->index) ||
            get_user(kp->type, &up->type) ||
            get_user(kp->flags, &up->flags) ||
@@ -360,8 +360,7 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct 
v4l2_buffer32 __user
                if (get_user(kp->bytesused, &up->bytesused) ||
                    get_user(kp->field, &up->field) ||
                    get_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
-                   get_user(kp->timestamp.tv_usec,
-                            &up->timestamp.tv_usec))
+                   get_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec))
                        return -EFAULT;
 
        if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
@@ -378,13 +377,12 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, 
struct v4l2_buffer32 __user
 
                uplane32 = compat_ptr(p);
                if (!access_ok(VERIFY_READ, uplane32,
-                              num_planes * sizeof(struct v4l2_plane32)))
+                              num_planes * sizeof(*uplane32)))
                        return -EFAULT;
 
                /* We don't really care if userspace decides to kill itself
                 * by passing a very big num_planes value */
-               uplane = compat_alloc_user_space(num_planes *
-                                                sizeof(struct v4l2_plane));
+               uplane = compat_alloc_user_space(num_planes * sizeof(*uplane));
                kp->m.planes = (__force struct v4l2_plane *)uplane;
 
                while (--num_planes >= 0) {
@@ -432,7 +430,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct 
v4l2_buffer32 __user
        int num_planes;
        int ret;
 
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_buffer32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(kp->index, &up->index) ||
            put_user(kp->type, &up->type) ||
            put_user(kp->flags, &up->flags) ||
@@ -443,7 +441,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct 
v4l2_buffer32 __user
            put_user(kp->field, &up->field) ||
            put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
            put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) ||
-           copy_to_user(&up->timecode, &kp->timecode, sizeof(struct 
v4l2_timecode)) ||
+           copy_to_user(&up->timecode, &kp->timecode, sizeof(kp->timecode)) ||
            put_user(kp->sequence, &up->sequence) ||
            put_user(kp->reserved2, &up->reserved2) ||
            put_user(kp->reserved, &up->reserved) ||
@@ -511,7 +509,7 @@ static int get_v4l2_framebuffer32(struct v4l2_framebuffer 
*kp, struct v4l2_frame
 {
        u32 tmp;
 
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_framebuffer32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            get_user(tmp, &up->base) ||
            get_user(kp->capability, &up->capability) ||
            get_user(kp->flags, &up->flags) ||
@@ -525,7 +523,7 @@ static int put_v4l2_framebuffer32(struct v4l2_framebuffer 
*kp, struct v4l2_frame
 {
        u32 tmp = (u32)((unsigned long)kp->base);
 
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_framebuffer32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(tmp, &up->base) ||
            put_user(kp->capability, &up->capability) ||
            put_user(kp->flags, &up->flags) ||
@@ -549,14 +547,14 @@ struct v4l2_input32 {
    Otherwise it is identical to the 32-bit version. */
 static inline int get_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 
__user *up)
 {
-       if (copy_from_user(kp, up, sizeof(struct v4l2_input32)))
+       if (copy_from_user(kp, up, sizeof(*up)))
                return -EFAULT;
        return 0;
 }
 
 static inline int put_v4l2_input32(struct v4l2_input *kp, struct v4l2_input32 
__user *up)
 {
-       if (copy_to_user(up, kp, sizeof(struct v4l2_input32)))
+       if (copy_to_user(up, kp, sizeof(*up)))
                return -EFAULT;
        return 0;
 }
@@ -604,12 +602,11 @@ static int get_v4l2_ext_controls32(struct 
v4l2_ext_controls *kp, struct v4l2_ext
        int n;
        compat_caddr_t p;
 
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_ext_controls32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            get_user(kp->ctrl_class, &up->ctrl_class) ||
            get_user(kp->count, &up->count) ||
            get_user(kp->error_idx, &up->error_idx) ||
-           copy_from_user(kp->reserved, up->reserved,
-                          sizeof(kp->reserved)))
+           copy_from_user(kp->reserved, up->reserved, sizeof(kp->reserved)))
                return -EFAULT;
        n = kp->count;
        if (n == 0) {
@@ -619,10 +616,9 @@ static int get_v4l2_ext_controls32(struct 
v4l2_ext_controls *kp, struct v4l2_ext
        if (get_user(p, &up->controls))
                return -EFAULT;
        ucontrols = compat_ptr(p);
-       if (!access_ok(VERIFY_READ, ucontrols,
-                      n * sizeof(struct v4l2_ext_control32)))
+       if (!access_ok(VERIFY_READ, ucontrols, n * sizeof(*ucontrols)))
                return -EFAULT;
-       kcontrols = compat_alloc_user_space(n * sizeof(struct 
v4l2_ext_control));
+       kcontrols = compat_alloc_user_space(n * sizeof(*kcontrols));
        kp->controls = (__force struct v4l2_ext_control *)kcontrols;
        while (--n >= 0) {
                u32 id;
@@ -654,7 +650,7 @@ static int put_v4l2_ext_controls32(struct v4l2_ext_controls 
*kp, struct v4l2_ext
        int n = kp->count;
        compat_caddr_t p;
 
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_ext_controls32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(kp->ctrl_class, &up->ctrl_class) ||
            put_user(kp->count, &up->count) ||
            put_user(kp->error_idx, &up->error_idx) ||
@@ -666,8 +662,7 @@ static int put_v4l2_ext_controls32(struct v4l2_ext_controls 
*kp, struct v4l2_ext
        if (get_user(p, &up->controls))
                return -EFAULT;
        ucontrols = compat_ptr(p);
-       if (!access_ok(VERIFY_WRITE, ucontrols,
-                      n * sizeof(struct v4l2_ext_control32)))
+       if (!access_ok(VERIFY_WRITE, ucontrols, n * sizeof(*ucontrols)))
                return -EFAULT;
 
        while (--n >= 0) {
@@ -704,7 +699,7 @@ struct v4l2_event32 {
 
 static int put_v4l2_event32(struct v4l2_event *kp, struct v4l2_event32 __user 
*up)
 {
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_event32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(kp->type, &up->type) ||
            copy_to_user(&up->u, &kp->u, sizeof(kp->u)) ||
            put_user(kp->pending, &up->pending) ||
@@ -712,7 +707,7 @@ static int put_v4l2_event32(struct v4l2_event *kp, struct 
v4l2_event32 __user *u
            put_user(kp->timestamp.tv_sec, &up->timestamp.tv_sec) ||
            put_user(kp->timestamp.tv_nsec, &up->timestamp.tv_nsec) ||
            put_user(kp->id, &up->id) ||
-           copy_to_user(up->reserved, kp->reserved, 8 * sizeof(__u32)))
+           copy_to_user(up->reserved, kp->reserved, sizeof(kp->reserved)))
                return -EFAULT;
        return 0;
 }
@@ -729,7 +724,7 @@ static int get_v4l2_edid32(struct v4l2_edid *kp, struct 
v4l2_edid32 __user *up)
 {
        u32 tmp;
 
-       if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_edid32)) ||
+       if (!access_ok(VERIFY_READ, up, sizeof(*up)) ||
            get_user(kp->pad, &up->pad) ||
            get_user(kp->start_block, &up->start_block) ||
            get_user(kp->blocks, &up->blocks) ||
@@ -744,7 +739,7 @@ static int put_v4l2_edid32(struct v4l2_edid *kp, struct 
v4l2_edid32 __user *up)
 {
        u32 tmp = (u32)((unsigned long)kp->edid);
 
-       if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_edid32)) ||
+       if (!access_ok(VERIFY_WRITE, up, sizeof(*up)) ||
            put_user(kp->pad, &up->pad) ||
            put_user(kp->start_block, &up->start_block) ||
            put_user(kp->blocks, &up->blocks) ||
-- 
2.15.1

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