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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-19 00:04:33 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-19 00:04:33 +0400 |
| commit | 822a2e452423e71fd9743cedf0b0fa8ac1ee6d12 (patch) | |
| tree | 560086641836bafb7b528115f2a00415c68d5965 /drivers | |
| parent | 2b666ca4a68cbc22483b0f2e1ba3c0e59b01ae9e (diff) | |
| parent | 3e645d6b485446c54c6745c5e2cf5c528fe4deec (diff) | |
| download | linux-822a2e452423e71fd9743cedf0b0fa8ac1ee6d12.tar.xz | |
Merge branch 'fixes'
* fixes:
v4l1: fix 32-bit compat microcode loading translation
De-pessimize rds_page_copy_user
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/v4l2-compat-ioctl32.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/drivers/media/video/v4l2-compat-ioctl32.c b/drivers/media/video/v4l2-compat-ioctl32.c index 073f01390cdd..86294ed35c9b 100644 --- a/drivers/media/video/v4l2-compat-ioctl32.c +++ b/drivers/media/video/v4l2-compat-ioctl32.c @@ -193,17 +193,24 @@ static int put_video_window32(struct video_window *kp, struct video_window32 __u struct video_code32 { char loadwhat[16]; /* name or tag of file being passed */ compat_int_t datasize; - unsigned char *data; + compat_uptr_t data; }; -static int get_microcode32(struct video_code *kp, struct video_code32 __user *up) +static struct video_code __user *get_microcode32(struct video_code32 *kp) { - if (!access_ok(VERIFY_READ, up, sizeof(struct video_code32)) || - copy_from_user(kp->loadwhat, up->loadwhat, sizeof(up->loadwhat)) || - get_user(kp->datasize, &up->datasize) || - copy_from_user(kp->data, up->data, up->datasize)) - return -EFAULT; - return 0; + struct video_code __user *up; + + up = compat_alloc_user_space(sizeof(*up)); + + /* + * NOTE! We don't actually care if these fail. If the + * user address is invalid, the native ioctl will do + * the error handling for us + */ + (void) copy_to_user(up->loadwhat, kp->loadwhat, sizeof(up->loadwhat)); + (void) put_user(kp->datasize, &up->datasize); + (void) put_user(compat_ptr(kp->data), &up->data); + return up; } #define VIDIOCGTUNER32 _IOWR('v', 4, struct video_tuner32) @@ -739,7 +746,7 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar struct video_tuner vt; struct video_buffer vb; struct video_window vw; - struct video_code vc; + struct video_code32 vc; struct video_audio va; #endif struct v4l2_format v2f; @@ -818,8 +825,11 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar break; case VIDIOCSMICROCODE: - err = get_microcode32(&karg.vc, up); - compatible_arg = 0; + /* Copy the 32-bit "video_code32" to kernel space */ + if (copy_from_user(&karg.vc, up, sizeof(karg.vc))) + return -EFAULT; + /* Convert the 32-bit version to a 64-bit version in user space */ + up = get_microcode32(&karg.vc); break; case VIDIOCSFREQ: |