This is a note to let you know that I've just added the patch titled media: TDA1997x: handle short reads of hdmi info frame. 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-tda1997x-handle-short-reads-of-hdmi-info-frame.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. commit 69d842db7531dc131fe94198141f91614206ee7e Author: Tom Rix <trix@xxxxxxxxxx> Date: Thu Aug 12 19:00:43 2021 +0200 media: TDA1997x: handle short reads of hdmi info frame. [ Upstream commit 48d219f9cc667bc6fbc3e3af0b1bfd75db94fce4 ] Static analysis reports this representative problem tda1997x.c:1939: warning: 7th function call argument is an uninitialized value The 7th argument is buffer[0], which is set in the earlier call to io_readn(). When io_readn() call to io_read() fails with the first read, buffer[0] is not set and 0 is returned and stored in len. The later call to hdmi_infoframe_unpack()'s size parameter is the static size of buffer, always 40, so a short read is not caught in hdmi_infoframe_unpacks()'s checking. The variable len should be used instead. Zero initialize buffer to 0 so it is in a known start state. Fixes: 9ac0038db9a7 ("media: i2c: Add TDA1997x HDMI receiver driver") Signed-off-by: Tom Rix <trix@xxxxxxxxxx> Reviewed-by: Tim Harvey <tharvey@xxxxxxxxxxxxx> Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/media/i2c/tda1997x.c b/drivers/media/i2c/tda1997x.c index 18a2027ba1450..5faffedb0feba 100644 --- a/drivers/media/i2c/tda1997x.c +++ b/drivers/media/i2c/tda1997x.c @@ -1247,13 +1247,13 @@ tda1997x_parse_infoframe(struct tda1997x_state *state, u16 addr) { struct v4l2_subdev *sd = &state->sd; union hdmi_infoframe frame; - u8 buffer[40]; + u8 buffer[40] = { 0 }; u8 reg; int len, err; /* read data */ len = io_readn(sd, addr, sizeof(buffer), buffer); - err = hdmi_infoframe_unpack(&frame, buffer, sizeof(buffer)); + err = hdmi_infoframe_unpack(&frame, buffer, len); if (err) { v4l_err(state->client, "failed parsing %d byte infoframe: 0x%04x/0x%02x\n", @@ -1927,13 +1927,13 @@ static int tda1997x_log_infoframe(struct v4l2_subdev *sd, int addr) { struct tda1997x_state *state = to_state(sd); union hdmi_infoframe frame; - u8 buffer[40]; + u8 buffer[40] = { 0 }; int len, err; /* read data */ len = io_readn(sd, addr, sizeof(buffer), buffer); v4l2_dbg(1, debug, sd, "infoframe: addr=%d len=%d\n", addr, len); - err = hdmi_infoframe_unpack(&frame, buffer, sizeof(buffer)); + err = hdmi_infoframe_unpack(&frame, buffer, len); if (err) { v4l_err(state->client, "failed parsing %d byte infoframe: 0x%04x/0x%02x\n",