diff options
| author | Ricardo Ribalda <ribalda@chromium.org> | 2024-04-04 20:56:18 +0300 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2024-06-17 02:39:09 +0300 |
| commit | c8931ef55bd325052ec496f242aea7f6de47dc9c (patch) | |
| tree | 378e69f5f4fd323c0f969b3ae0887eea22b50f6f /drivers/media/usb | |
| parent | 85fbe91a7c9210bb30638846b551fa5d3cb7bc4c (diff) | |
| download | linux-c8931ef55bd325052ec496f242aea7f6de47dc9c.tar.xz | |
media: uvcvideo: Enforce alignment of frame and interval
Struct uvc_frame and interval (u32*) are packaged together on
streaming->formats on a single contiguous allocation.
Right now they are allocated right after uvc_format, without taking into
consideration their required alignment.
This is working fine because both structures have a field with a
pointer, but it will stop working when the sizeof() of any of those
structs is not a multiple of the sizeof(void*).
Enforce that alignment during the allocation.
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240404-uvc-align-v2-1-9e104b0ecfbd@chromium.org
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_driver.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index d435b6a6c295..13c2c11cfdf6 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -687,16 +687,26 @@ static int uvc_parse_streaming(struct uvc_device *dev, goto error; } - size = nformats * sizeof(*format) + nframes * sizeof(*frame) + /* + * Allocate memory for the formats, the frames and the intervals, + * plus any required padding to guarantee that everything has the + * correct alignment. + */ + size = nformats * sizeof(*format); + size = ALIGN(size, __alignof__(*frame)) + nframes * sizeof(*frame); + size = ALIGN(size, __alignof__(*interval)) + nintervals * sizeof(*interval); + format = kzalloc(size, GFP_KERNEL); - if (format == NULL) { + if (!format) { ret = -ENOMEM; goto error; } - frame = (struct uvc_frame *)&format[nformats]; - interval = (u32 *)&frame[nframes]; + frame = (void *)format + nformats * sizeof(*format); + frame = PTR_ALIGN(frame, __alignof__(*frame)); + interval = (void *)frame + nframes * sizeof(*frame); + interval = PTR_ALIGN(interval, __alignof__(*interval)); streaming->formats = format; streaming->nformats = 0; |