From 598c42c78919117dc0d235ae22d17ad642377483 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 2 Mar 2023 08:47:04 +0100 Subject: [PATCH] drm/edid: fix info leak when failing to get panel id commit 4d8457fe0eb9c80ff7795cf8a30962128b71d853 upstream. 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: 69c7717c20cc ("drm/edid: Dump the EDID when drm_edid_get_panel_id() has an error") Cc: stable@vger.kernel.org # 6.2 Cc: Douglas Anderson Signed-off-by: Johan Hovold Reviewed-by: Jani Nikula Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson Link: https://patchwork.freedesktop.org/patch/msgid/20230302074704.11371-1-johan+linaro@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/drm_edid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index b94adb9bbefb..0116c947a4b3 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -2797,7 +2797,7 @@ u32 drm_edid_get_panel_id(struct i2c_adapter *adapter) * 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) return 0;