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drm/edid: fix info leak when failing to get panel id

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Make sure to clear the transfer buffer before fetching the EDID to
avoid leaking slab data to the logs on errors that leave the buffer
unchanged.

Fixes: 69c7717c20 ("drm/edid: Dump the EDID when drm_edid_get_panel_id() has an error")
Cc: stable@vger.kernel.org	# 6.2
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230302074704.11371-1-johan+linaro@kernel.org
This commit is contained in:
Johan Hovold
2023-03-02 08:47:04 +01:00
committed by Douglas Anderson
parent 77bc762451
commit 4d8457fe0e
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_edid.c
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@@ -2797,7 +2797,7 @@ u32 drm_edid_get_panel_id(struct i2c_adapter *adapter)
* the EDID then we'll just return 0. * the EDID then we'll just return 0.
*/ */
base_block = kmalloc(EDID_LENGTH, GFP_KERNEL); base_block = kzalloc(EDID_LENGTH, GFP_KERNEL);
if (!base_block) if (!base_block)
return 0; return 0;