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diff --git a/sys/geom/label/g_label_msdosfs.c b/sys/geom/label/g_label_msdosfs.c
--- a/sys/geom/label/g_label_msdosfs.c
+++ b/sys/geom/label/g_label_msdosfs.c
@@ -156,6 +156,12 @@
G_LABEL_DEBUG(2,
"MSDOSFS: FAT_FirstDataSector=0x%x, FAT_BytesPerSector=%d",
fat_FirstDataSector, fat_BytesPerSector);
+ if (fat_BytesPerSector == 0 ||
+ fat_BytesPerSector % pp->sectorsize != 0) {
+ G_LABEL_DEBUG(1, "MSDOSFS: %s: corrupted BPB",
+ pp->name);
+ goto error;
+ }
for (offset = fat_BytesPerSector * fat_FirstDataSector;;
offset += fat_BytesPerSector) {

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