From: Corentin Labbe <clabbe@xxxxxxxxxxxx> [ 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> --- drivers/staging/media/zoran/zoran_device.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/zoran/zoran_device.c b/drivers/staging/media/zoran/zoran_device.c index e569a1341d01..913f5a3c5bfc 100644 --- a/drivers/staging/media/zoran/zoran_device.c +++ b/drivers/staging/media/zoran/zoran_device.c @@ -879,7 +879,7 @@ 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) { @@ -891,6 +891,11 @@ 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) { -- 2.34.1