This is a note to let you know that I've just added the patch titled media: staging/intel-ipu3: Fix set_fmt error handling to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: media-staging-intel-ipu3-fix-set_fmt-error-handling.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ad91849996f9dd79741a961fd03585a683b08356 Mon Sep 17 00:00:00 2001 From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> Date: Wed, 10 Mar 2021 01:16:46 +0100 Subject: media: staging/intel-ipu3: Fix set_fmt error handling From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> commit ad91849996f9dd79741a961fd03585a683b08356 upstream. 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@xxxxxxxxxxxxxxx Fixes: 6d5f26f2e045 ("media: staging/intel-ipu3-v4l: reduce kernel stack usage") Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/media/ipu3/ipu3-v4l2.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/staging/media/ipu3/ipu3-v4l2.c +++ b/drivers/staging/media/ipu3/ipu3-v4l2.c @@ -668,6 +668,7 @@ static int imgu_fmt(struct imgu_device * 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); @@ -736,6 +737,7 @@ static int imgu_fmt(struct imgu_device * ret = -EINVAL; goto out; } + fmt_backup = *fmts[css_q]; *fmts[css_q] = f->fmt.pix_mp; if (try) @@ -743,6 +745,9 @@ static int imgu_fmt(struct imgu_device * 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; Patches currently in stable-queue which might be from ribalda@xxxxxxxxxxxx are queue-5.4/media-staging-intel-ipu3-fix-race-condition-during-set_fmt.patch queue-5.4/media-staging-intel-ipu3-fix-set_fmt-error-handling.patch queue-5.4/media-staging-intel-ipu3-fix-memory-leak-in-imu_fmt.patch