From: Ivan Abramov Date: Tue, 2 Sep 2025 23:23:31 +0000 (+0300) Subject: media: adv7842: Avoid possible out-of-bounds array accesses in adv7842_cp_log_status() X-Git-Tag: v6.19-rc1~159^2~233 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8163419e3e05d71dcfa8fb49c8fdf8d76908fe51;p=thirdparty%2Fkernel%2Flinux.git media: adv7842: Avoid possible out-of-bounds array accesses in adv7842_cp_log_status() It's possible for cp_read() and hdmi_read() to return -EIO. Those values are further used as indexes for accessing arrays. Fix that by checking return values where it's needed. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: a89bcd4c6c20 ("[media] adv7842: add new video decoder driver") Cc: stable@vger.kernel.org Signed-off-by: Ivan Abramov Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/i2c/adv7842.c b/drivers/media/i2c/adv7842.c index 331c5171d1ab2..21c3d3682e0b4 100644 --- a/drivers/media/i2c/adv7842.c +++ b/drivers/media/i2c/adv7842.c @@ -2699,6 +2699,7 @@ static int adv7842_cp_log_status(struct v4l2_subdev *sd) /* CP block */ struct adv7842_state *state = to_state(sd); struct v4l2_dv_timings timings; + int temp; u8 reg_io_0x02 = io_read(sd, 0x02); u8 reg_io_0x21 = io_read(sd, 0x21); u8 reg_rep_0x77 = rep_read(sd, 0x77); @@ -2821,8 +2822,9 @@ static int adv7842_cp_log_status(struct v4l2_subdev *sd) (((reg_io_0x02 >> 2) & 0x01) ^ (reg_io_0x02 & 0x01)) ? "(16-235)" : "(0-255)", (reg_io_0x02 & 0x08) ? "enabled" : "disabled"); + temp = cp_read(sd, 0xf4) >> 4; v4l2_info(sd, "Color space conversion: %s\n", - csc_coeff_sel_rb[cp_read(sd, 0xf4) >> 4]); + temp < 0 ? "" : csc_coeff_sel_rb[temp]); if (!is_digital_input(sd)) return 0; @@ -2852,8 +2854,9 @@ static int adv7842_cp_log_status(struct v4l2_subdev *sd) hdmi_read(sd, 0x5f)); v4l2_info(sd, "AV Mute: %s\n", (hdmi_read(sd, 0x04) & 0x40) ? "on" : "off"); + temp = hdmi_read(sd, 0x0b) >> 6; v4l2_info(sd, "Deep color mode: %s\n", - deep_color_mode_txt[hdmi_read(sd, 0x0b) >> 6]); + temp < 0 ? "" : deep_color_mode_txt[temp]); adv7842_log_infoframes(sd);