summaryrefslogtreecommitdiffstats
path: root/drivers/media
diff options
context:
space:
mode:
authorDan Carpenter <dan.carpenter@oracle.com>2019-04-11 05:01:57 -0400
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-05-08 13:58:49 -0400
commitdd6e2a981bfe83aa4a493143fd8cf1edcda6c091 (patch)
tree61bb7db93ae43d39556f39c38a5e927141f746ce /drivers/media
parent583958cba72ffd092e9e3c8a8a284cb154c34b1c (diff)
downloadlinux-dd6e2a981bfe83aa4a493143fd8cf1edcda6c091.tar.bz2
media: omap_vout: potential buffer overflow in vidioc_dqbuf()
The "b->index" is a u32 the comes from the user in the ioctl. It hasn't been checked. We aren't supposed to use it but we're instead supposed to use the value that gets written to it when we call videobuf_dqbuf(). The videobuf_dqbuf() first memsets it to zero and then re-initializes it inside the videobuf_status() function. It's this final value which we want. Hans Verkuil pointed out that we need to check the return from videobuf_dqbuf(). I ended up doing a little cleanup related to that as well. Fixes: 72915e851da9 ("[media] V4L2: OMAP: VOUT: dma map and unmap v4l2 buffers in qbuf and dqbuf") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/platform/omap/omap_vout.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c
index 37f0d7146dfa..cb6a9e3946b6 100644
--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -1527,23 +1527,20 @@ static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
unsigned long size;
struct videobuf_buffer *vb;
- vb = q->bufs[b->index];
-
if (!vout->streaming)
return -EINVAL;
- if (file->f_flags & O_NONBLOCK)
- /* Call videobuf_dqbuf for non blocking mode */
- ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 1);
- else
- /* Call videobuf_dqbuf for blocking mode */
- ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 0);
+ ret = videobuf_dqbuf(q, b, !!(file->f_flags & O_NONBLOCK));
+ if (ret)
+ return ret;
+
+ vb = q->bufs[b->index];
addr = (unsigned long) vout->buf_phy_addr[vb->i];
size = (unsigned long) vb->size;
dma_unmap_single(vout->vid_dev->v4l2_dev.dev, addr,
size, DMA_TO_DEVICE);
- return ret;
+ return 0;
}
static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)