Pointers V4L2 pixelformat and dataformat fields in a few packed structs
are directly passed to printk family of functions. This could result in an
unaligned access albeit no such possibility appears to exist at the
moment i.e. this clang warning appears to be a false positive.
Address the warning by copying the pixelformat or dataformat value to a
local variable first.
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Fixes: e927e1e0f0dd ("v4l: ioctl: Use %p4cc printk modifier to print FourCC codes")
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
Hi Andy, Nick,
How about this one?
I believe it does address the clang warning although I haven't tested it.
Kind regards,
Sakari
drivers/media/v4l2-core/v4l2-ioctl.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 9ac557b8e146..642cb90f457c 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -279,8 +279,8 @@ static void v4l_print_format(const void *arg, bool write_only)
const struct v4l2_vbi_format *vbi;
const struct v4l2_sliced_vbi_format *sliced;
const struct v4l2_window *win;
- const struct v4l2_sdr_format *sdr;
const struct v4l2_meta_format *meta;
+ u32 pixelformat;
u32 planes;
unsigned i;
@@ -299,8 +299,9 @@ static void v4l_print_format(const void *arg, bool write_only)
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
mp = &p->fmt.pix_mp;
+ pixelformat = mp->pixelformat;
pr_cont(", width=%u, height=%u, format=%p4cc, field=%s, colorspace=%d, num_planes=%u, flags=0x%x, ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
- mp->width, mp->height, &mp->pixelformat,
+ mp->width, mp->height, &pixelformat,
prt_names(mp->field, v4l2_field_names),
mp->colorspace, mp->num_planes, mp->flags,
mp->ycbcr_enc, mp->quantization, mp->xfer_func);
@@ -343,14 +344,15 @@ static void v4l_print_format(const void *arg, bool write_only)
break;
case V4L2_BUF_TYPE_SDR_CAPTURE:
case V4L2_BUF_TYPE_SDR_OUTPUT:
- sdr = &p->fmt.sdr;
- pr_cont(", pixelformat=%p4cc\n", &sdr->pixelformat);
+ pixelformat = p->fmt.sdr.pixelformat;
+ pr_cont(", pixelformat=%p4cc\n", &pixelformat);
break;
case V4L2_BUF_TYPE_META_CAPTURE:
case V4L2_BUF_TYPE_META_OUTPUT:
meta = &p->fmt.meta;
+ pixelformat = meta->dataformat;
pr_cont(", dataformat=%p4cc, buffersize=%u\n",
- &meta->dataformat, meta->buffersize);
+ &pixelformat, meta->buffersize);
break;
}
}
--
2.30.2
