This is a note to let you know that I've just added the patch titled media: staging: media: zoran: calculate the right buffer number for zoran_reap_stat_com to the 5.15-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-media-zoran-calculate-the-right-buffer.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit beec793725705c7eeba71f20355766e9fa0975b6 Author: Corentin Labbe <clabbe@xxxxxxxxxxxx> Date: Tue Dec 14 17:16:32 2021 +0100 media: staging: media: zoran: calculate the right buffer number for zoran_reap_stat_com [ Upstream commit e3b86f4e558cea9eed71d894df2f19b10d60a207 ] On the case tmp_dcim=1, the index of buffer is miscalculated. This generate a NULL pointer dereference later. So let's fix the calcul and add a check to prevent this to reappear. Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx> Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/staging/media/zoran/zoran_device.c b/drivers/staging/media/zoran/zoran_device.c index 5b12a730a229..fb1f0465ca87 100644 --- a/drivers/staging/media/zoran/zoran_device.c +++ b/drivers/staging/media/zoran/zoran_device.c @@ -814,7 +814,7 @@ static void zoran_reap_stat_com(struct zoran *zr) if (zr->jpg_settings.tmp_dcm == 1) i = (zr->jpg_dma_tail - zr->jpg_err_shift) & BUZ_MASK_STAT_COM; else - i = ((zr->jpg_dma_tail - zr->jpg_err_shift) & 1) * 2 + 1; + i = ((zr->jpg_dma_tail - zr->jpg_err_shift) & 1) * 2; stat_com = le32_to_cpu(zr->stat_com[i]); if ((stat_com & 1) == 0) { @@ -826,6 +826,11 @@ static void zoran_reap_stat_com(struct zoran *zr) size = (stat_com & GENMASK(22, 1)) >> 1; buf = zr->inuse[i]; + if (!buf) { + spin_unlock_irqrestore(&zr->queued_bufs_lock, flags); + pci_err(zr->pci_dev, "No buffer at slot %d\n", i); + return; + } buf->vbuf.vb2_buf.timestamp = ktime_get_ns(); if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {