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@ -2145,7 +2145,7 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
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return ISO_ASSERT_FAILURE;
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}
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/* This eventually overwrites the non-mbr_req partition table entries
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/* This possibly overwrites the non-mbr_req partition table entries
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made so far. Overwriting those from t->mbr_req is not allowed.
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*/
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if (sa_type == 3 || !t->opts->appended_as_gpt) {
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@ -2175,6 +2175,9 @@ int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
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if (sa_type == 0 && (t->system_area_options & 0x4000) && !do_isohybrid) {
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/* Patch MBR for GRUB2 */
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if (t->num_bootsrc <= 0)
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return iso_msg_submit(t->image->id, ISO_BOOT_IMAGE_NOT_VALID, 0,
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"No boot image found as jump target for GRUB2 MBR.");
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if (t->bootsrc[0] == NULL)
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return iso_msg_submit(t->image->id, ISO_BOOT_IMAGE_NOT_VALID, 0,
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"Cannot refer by GRUB2 MBR to data outside of ISO 9660 filesystem.");
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