[PATCH] video/hdmi: handle short reads of hdmi info frame.

From: trix
Date: Thu Aug 12 2021 - 13:03:05 EST


From: Tom Rix <trix@xxxxxxxxxx>

Calling hdmi_infoframe_unpack() with static sizeof(buffer) skips all
the size checking done later in hdmi_infoframe_unpack(). A better
value is the amount of data read into buffer.

Fixes: 480b8b3e42c3 ("video/hdmi: Pass buffer size to infoframe unpack functions")
Signed-off-by: Tom Rix <trix@xxxxxxxxxx>
---
drivers/media/i2c/adv7511-v4l2.c | 2 +-
drivers/media/i2c/adv7604.c | 2 +-
drivers/media/i2c/adv7842.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/adv7511-v4l2.c b/drivers/media/i2c/adv7511-v4l2.c
index 41f4e749a859c..2217004264e4b 100644
--- a/drivers/media/i2c/adv7511-v4l2.c
+++ b/drivers/media/i2c/adv7511-v4l2.c
@@ -544,7 +544,7 @@ static void log_infoframe(struct v4l2_subdev *sd, const struct adv7511_cfg_read_
buffer[3] = 0;
buffer[3] = hdmi_infoframe_checksum(buffer, len + 4);

- if (hdmi_infoframe_unpack(&frame, buffer, sizeof(buffer)) < 0) {
+ if (hdmi_infoframe_unpack(&frame, buffer, len + 4) < 0) {
v4l2_err(sd, "%s: unpack of %s infoframe failed\n", __func__, cri->desc);
return;
}
diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index 122e1fdccd962..d688ffff7a074 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -2484,7 +2484,7 @@ static int adv76xx_read_infoframe(struct v4l2_subdev *sd, int index,
buffer[i + 3] = infoframe_read(sd,
adv76xx_cri[index].payload_addr + i);

- if (hdmi_infoframe_unpack(frame, buffer, sizeof(buffer)) < 0) {
+ if (hdmi_infoframe_unpack(frame, buffer, len + 3) < 0) {
v4l2_err(sd, "%s: unpack of %s infoframe failed\n", __func__,
adv76xx_cri[index].desc);
return -ENOENT;
diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c
index 7f8acbdf0db4a..8ab4c63839b49 100644
--- a/drivers/media/i2c/adv7842.c
+++ b/drivers/media/i2c/adv7842.c
@@ -2593,7 +2593,7 @@ static void log_infoframe(struct v4l2_subdev *sd, const struct adv7842_cfg_read_
for (i = 0; i < len; i++)
buffer[i + 3] = infoframe_read(sd, cri->payload_addr + i);

- if (hdmi_infoframe_unpack(&frame, buffer, sizeof(buffer)) < 0) {
+ if (hdmi_infoframe_unpack(&frame, buffer, len + 3) < 0) {
v4l2_err(sd, "%s: unpack of %s infoframe failed\n", __func__, cri->desc);
return;
}
--
2.26.3