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Subject: media: staging/intel-ipu3: Fix set_fmt error handling Author: Ricardo Ribalda ribalda@chromium.org Date: Wed Mar 10 01:16:46 2021 +0100

If there in an error during a set_fmt, do not overwrite the previous sizes with the invalid config.

Without this patch, v4l2-compliance ends up allocating 4GiB of RAM and causing the following OOPs

[ 38.662975] ipu3-imgu 0000:00:05.0: swiotlb buffer is full (sz: 4096 bytes) [ 38.662980] DMA: Out of SW-IOMMU space for 4096 bytes at device 0000:00:05.0 [ 38.663010] general protection fault: 0000 [#1] PREEMPT SMP

Cc: stable@vger.kernel.org Fixes: 6d5f26f2e045 ("media: staging/intel-ipu3-v4l: reduce kernel stack usage") Signed-off-by: Ricardo Ribalda ribalda@chromium.org Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org

drivers/staging/media/ipu3/ipu3-v4l2.c | 5 +++++ 1 file changed, 5 insertions(+)

---

diff --git a/drivers/staging/media/ipu3/ipu3-v4l2.c b/drivers/staging/media/ipu3/ipu3-v4l2.c index 60aa02eb7d2a..e8944e489c56 100644 --- a/drivers/staging/media/ipu3/ipu3-v4l2.c +++ b/drivers/staging/media/ipu3/ipu3-v4l2.c @@ -669,6 +669,7 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node, struct imgu_css_pipe *css_pipe = &imgu->css.pipes[pipe]; struct imgu_media_pipe *imgu_pipe = &imgu->imgu_pipe[pipe]; struct imgu_v4l2_subdev *imgu_sd = &imgu_pipe->imgu_sd; + struct v4l2_pix_format_mplane fmt_backup;

dev_dbg(dev, "set fmt node [%u][%u](try = %u)", pipe, node, try);

@@ -734,6 +735,7 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node, ret = -EINVAL; goto out; } + fmt_backup = *fmts[css_q]; *fmts[css_q] = f->fmt.pix_mp;

if (try) @@ -741,6 +743,9 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node, else ret = imgu_css_fmt_set(&imgu->css, fmts, rects, pipe);

+ if (try || ret < 0) + *fmts[css_q] = fmt_backup; + /* ret is the binary number in the firmware blob */ if (ret < 0) goto out;