diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
index 6aec6288e1f2..7f39b1c6469c 100644
--- a/fs/exfat/exfat_raw.h
+++ b/fs/exfat/exfat_raw.h
@@ -77,6 +77,10 @@
 
 #define EXFAT_FILE_NAME_LEN		15
 
+#define EXFAT_MIN_SECT_SIZE_BITS		9
+#define EXFAT_MAX_SECT_SIZE_BITS		12
+#define EXFAT_MAX_SECT_PER_CLUS_BITS(x)		(25 - (x)->sect_size_bits)
+
 /* EXFAT: Main and Backup Boot Sector (512 bytes) */
 struct boot_sector {
 	__u8	jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
diff --git a/fs/exfat/super.c b/fs/exfat/super.c
index 87be5bfc31eb..c6d8d2e53486 100644
--- a/fs/exfat/super.c
+++ b/fs/exfat/super.c
@@ -381,8 +381,7 @@ static int exfat_calibrate_blocksize(struct super_block *sb, int logical_sect)
 {
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 
-	if (!is_power_of_2(logical_sect) ||
-	    logical_sect < 512 || logical_sect > 4096) {
+	if (!is_power_of_2(logical_sect)) {
 		exfat_err(sb, "bogus logical sector size %u", logical_sect);
 		return -EIO;
 	}
@@ -451,6 +450,25 @@ static int exfat_read_boot_sector(struct super_block *sb)
 		return -EINVAL;
 	}
 
+	/*
+	 * sect_size_bits could be at least 9 and at most 12.
+	 */
+	if (p_boot->sect_size_bits < EXFAT_MIN_SECT_SIZE_BITS ||
+	    p_boot->sect_size_bits > EXFAT_MAX_SECT_SIZE_BITS) {
+		exfat_err(sb, "bogus sector size bits : %u\n",
+				p_boot->sect_size_bits);
+		return -EINVAL;
+	}
+
+	/*
+	 * sect_per_clus_bits could be at least 0 and at most 25 - sect_size_bits.
+	 */
+	if (p_boot->sect_per_clus_bits > EXFAT_MAX_SECT_PER_CLUS_BITS(p_boot)) {
+		exfat_err(sb, "bogus sectors bits per cluster : %u\n",
+				p_boot->sect_per_clus_bits);
+		return -EINVAL;
+	}
+
 	sbi->sect_per_clus = 1 << p_boot->sect_per_clus_bits;
 	sbi->sect_per_clus_bits = p_boot->sect_per_clus_bits;
 	sbi->cluster_size_bits = p_boot->sect_per_clus_bits +
@@ -477,16 +495,19 @@ static int exfat_read_boot_sector(struct super_block *sb)
 	sbi->used_clusters = EXFAT_CLUSTERS_UNTRACKED;
 
 	/* check consistencies */
-	if (sbi->num_FAT_sectors << p_boot->sect_size_bits <
-	    sbi->num_clusters * 4) {
+	if ((u64)sbi->num_FAT_sectors << p_boot->sect_size_bits <
+	    (u64)sbi->num_clusters * 4) {
 		exfat_err(sb, "bogus fat length");
 		return -EINVAL;
 	}
+
 	if (sbi->data_start_sector <
-	    sbi->FAT1_start_sector + sbi->num_FAT_sectors * p_boot->num_fats) {
+	    (u64)sbi->FAT1_start_sector +
+	    (u64)sbi->num_FAT_sectors * p_boot->num_fats) {
 		exfat_err(sb, "bogus data start sector");
 		return -EINVAL;
 	}
+
 	if (sbi->vol_flags & VOLUME_DIRTY)
 		exfat_warn(sb, "Volume was not properly unmounted. Some data may be corrupt. Please run fsck.");
 	if (sbi->vol_flags & MEDIA_FAILURE)