oofatfs: bound CREATE_LINKMAP FAT chain walk - #13
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A USB host can supply a cyclic FAT chain to PSRAM virtual-disk imports, causing CREATE_LINKMAP to loop until watchdog reset. Count every cluster examined across contiguous fragments and fail with FR_INT_ERR when the walk exceeds fs->n_fatent.
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The only behavioral change is that an invalid cyclic chain now returns FR_INT_ERR instead of looping forever. |
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A USB host can supply a cyclic FAT chain to PSRAM virtual-disk imports, causing CREATE_LINKMAP to loop until watchdog reset. Count every cluster examined across contiguous fragments and fail with FR_INT_ERR when the walk exceeds fs->n_fatent.
DOS vector only.