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drm/edid: fix invalid EDID extension block filtering
[ Upstream commit3aefc722ff
] The invalid EDID block filtering uses the number of valid EDID extensions instead of all EDID extensions for looping the extensions in the copy. This is fine, by coincidence, if all the invalid blocks are at the end of the EDID. However, it's completely broken if there are invalid extensions in the middle; the invalid blocks are included and valid blocks are excluded. Fix it by modifying the base block after, not before, the copy. Fixes:14544d0937
("drm/edid: Only print the bad edid when aborting") Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220330170426.349248-1-jani.nikula@intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 3 additions and 3 deletions
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@ -1994,9 +1994,6 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
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connector_bad_edid(connector, edid, edid[0x7e] + 1);
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edid[EDID_LENGTH-1] += edid[0x7e] - valid_extensions;
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edid[0x7e] = valid_extensions;
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new = kmalloc_array(valid_extensions + 1, EDID_LENGTH,
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GFP_KERNEL);
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if (!new)
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@ -2013,6 +2010,9 @@ struct edid *drm_do_get_edid(struct drm_connector *connector,
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base += EDID_LENGTH;
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}
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new[EDID_LENGTH - 1] += new[0x7e] - valid_extensions;
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new[0x7e] = valid_extensions;
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kfree(edid);
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edid = new;
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}
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