D23082.id66479.diff
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	Index: sbin/fsck_msdosfs/boot.c
	===================================================================
	--- sbin/fsck_msdosfs/boot.c
	+++ sbin/fsck_msdosfs/boot.c
	@@ -266,8 +266,11 @@
	return FSFATAL;
	}

	- boot->NumClusters = (boot->NumSectors - boot->FirstCluster) / boot->bpbSecPerClust +
	- CLUST_FIRST;
	+ /*
	+ * The number of clusters is derived from available data sectors, divided
	+ * by sectors per cluster.
	+ */
	+ boot->NumClusters = (boot->NumSectors - boot->FirstCluster) / boot->bpbSecPerClust;

	if (boot->flags & FAT32) {
	if (boot->NumClusters > (CLUST_RSRVD & CLUST32_MASK)) {
	@@ -310,11 +313,19 @@
	break;
	}

	- if (boot->NumFatEntries < boot->NumClusters - CLUST_FIRST) {
	+ if (boot->NumFatEntries < boot->NumClusters) {
	pfatal("FAT size too small, %u entries won't fit into %u sectors\n",
	boot->NumClusters, boot->FATsecs);
	return FSFATAL;
	}
	+
	+ /*
	+ * There are two reserved clusters. To avoid adding CLUST_FIRST every time
	+ * when we perform boundary checks, we increment the NumClusters by 2,
	+ * which is CLUST_FIRST to denote the first out-of-range cluster number.
	+ */
	+ boot->NumClusters += CLUST_FIRST;
	+
	boot->ClusterSize = boot->bpbBytesPerSec * boot->bpbSecPerClust;

	boot->NumFiles = 1;