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<a href="https://gitlab.com/dueno">Daiki Ueno</a> created a merge request: <a href="https://gitlab.com/gnutls/libtasn1/-/merge_requests/95">!95</a>
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Project:Branches: dueno/libtasn1:wip/dueno/empty-octet-string to gnutls/libtasn1:master
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Author: Daiki Ueno
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Assignees:
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Reviewers:
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<div class="md gl-mt-5" style="color: #333238; word-wrap: break-word; margin-top: 1rem;">
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">When the input was an empty OCTET STRING (i.e., 0x04 0x00 in DER),
asn1_decode_simple_der previously returned ASN1_DER_ERROR.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">With this patch, the function properly returns zero as the length,
while the output pointer is set to the start of the input, to satisfy
the invariant that it is a valid pointer inside the input.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Fixes: <a href="https://gitlab.com/gnutls/libtasn1/-/issues/48" data-reference-type="issue" data-original="#48" data-link="false" data-link-reference="false" data-project="919981" data-issue="141980820" data-project-path="gnutls/libtasn1" data-iid="48" data-issue-type="issue" data-container="body" data-placement="top" title="asn1_decode_simple_der doesn't accept empty OCTET STRING" class="gfm gfm-issue" style="margin-top: 0;">#48</a></p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-checklist" class="anchor" href="#checklist" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Checklist</h2>
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<li class="task-list-item" style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> Code modified for feature</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> Test suite updated with functionality tests</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> Test suite updated with negative tests</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> Documentation updated</li>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-reviewers-checklist" class="anchor" href="#reviewers-checklist" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Reviewer's checklist:</h2>
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<li class="task-list-item" style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> There is a test suite reasonably covering new functionality or modifications</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> Function naming, parameters, return values, types, etc., are consistent with other code</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> This feature/change has adequate documentation added</li>
<li class="task-list-item" style="line-height: 1.6em; margin-left: 25px; padding-left: 3px; list-style-type: none; position: relative; min-height: 22px; padding-inline-start: 28px; margin-inline-start: 0 !important;">
<task-button style="margin-top: 0;"></task-button><input type="checkbox" class="task-list-item-checkbox" disabled style="position: absolute; inset-inline-start: 8px; inset-block-start: 5px;"> No obvious mistakes in the code</li>
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