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63 lines
2.0 KiB
63 lines
2.0 KiB
2 years ago
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diff --git a/lib/xmlparse.c b/lib/xmlparse.c
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index d54af683..5ce31402 100644
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--- a/lib/xmlparse.c
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+++ b/lib/xmlparse.c
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@@ -2067,6 +2067,11 @@ XML_GetBuffer(XML_Parser parser, int len) {
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keep = (int)EXPAT_SAFE_PTR_DIFF(parser->m_bufferPtr, parser->m_buffer);
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if (keep > XML_CONTEXT_BYTES)
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keep = XML_CONTEXT_BYTES;
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+ /* Detect and prevent integer overflow */
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+ if (keep > INT_MAX - neededSize) {
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+ parser->m_errorCode = XML_ERROR_NO_MEMORY;
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+ return NULL;
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+ }
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neededSize += keep;
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#endif /* defined XML_CONTEXT_BYTES */
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if (neededSize
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diff --git a/tests/runtests.c b/tests/runtests.c
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index e89e8220..579dad1a 100644
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--- a/tests/runtests.c
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+++ b/tests/runtests.c
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@@ -3847,6 +3847,30 @@ START_TEST(test_get_buffer_2) {
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}
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END_TEST
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+/* Test for signed integer overflow CVE-2022-23852 */
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+#if defined(XML_CONTEXT_BYTES)
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+START_TEST(test_get_buffer_3_overflow) {
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+ XML_Parser parser = XML_ParserCreate(NULL);
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+ assert(parser != NULL);
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+
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+ const char *const text = "\n";
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+ const int expectedKeepValue = (int)strlen(text);
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+
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+ // After this call, variable "keep" in XML_GetBuffer will
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+ // have value expectedKeepValue
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+ if (XML_Parse(parser, text, (int)strlen(text), XML_FALSE /* isFinal */)
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+ == XML_STATUS_ERROR)
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+ xml_failure(parser);
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+
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+ assert(expectedKeepValue > 0);
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+ if (XML_GetBuffer(parser, INT_MAX - expectedKeepValue + 1) != NULL)
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+ fail("enlarging buffer not failed");
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+
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+ XML_ParserFree(parser);
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+}
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+END_TEST
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+#endif // defined(XML_CONTEXT_BYTES)
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+
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/* Test position information macros */
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START_TEST(test_byte_info_at_end) {
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const char *text = "<doc></doc>";
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@@ -11731,6 +11755,9 @@ make_suite(void) {
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tcase_add_test(tc_basic, test_empty_parse);
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tcase_add_test(tc_basic, test_get_buffer_1);
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tcase_add_test(tc_basic, test_get_buffer_2);
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+#if defined(XML_CONTEXT_BYTES)
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+ tcase_add_test(tc_basic, test_get_buffer_3_overflow);
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+#endif
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tcase_add_test(tc_basic, test_byte_info_at_end);
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tcase_add_test(tc_basic, test_byte_info_at_error);
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tcase_add_test(tc_basic, test_byte_info_at_cdata);
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