diff --git a/tsk/fs/exfatfs_dent.c b/tsk/fs/exfatfs_dent.c
index 6d48d8e3ee6ff6ba156dc8eac57547103f32a609..714d88a21dc1a6aa8c34a96b1452f331508be3cc 100755
--- a/tsk/fs/exfatfs_dent.c
+++ b/tsk/fs/exfatfs_dent.c
@@ -47,7 +47,7 @@ typedef struct {
     uint8_t expected_name_length_utf16_chars;     /* Name length (in characters) as reported by the file stream dentry */
     uint8_t current_file_name_length_utf16_chars; /* Number of UTF16 name characters read in so far */
     uint8_t file_name_utf16[(EXFATFS_MAX_FILE_NAME_LENGTH_UTF16_CHARS + 1) * 2];  /* The UTF16 characters read in so far*/
-    uint8_t actual_name_length_utf8_bytes;  /* Length of the UTF8 version of the name (stored in fs_name) */
+    size_t actual_name_length_utf8_bytes;  /* Length of the UTF8 version of the name (stored in fs_name) */
     TSK_FS_NAME *fs_name;
     TSK_FS_DIR *fs_dir;
 } EXFATFS_FS_NAME_INFO;
@@ -257,7 +257,7 @@ static void
 exfats_parse_file_name_dentry(EXFATFS_FS_NAME_INFO *a_name_info, FATFS_DENTRY *a_dentry, TSK_INUM_T a_inum)
 {
     EXFATFS_FILE_NAME_DIR_ENTRY *dentry = (EXFATFS_FILE_NAME_DIR_ENTRY*)a_dentry;
-    size_t num_utf16_chars_to_copy = 0;
+    uint8_t num_utf16_chars_to_copy = 0;
 
     assert(a_name_info != NULL);
     assert(a_name_info->fatfs != NULL);
@@ -373,7 +373,7 @@ exfats_parse_vol_label_dentry(EXFATFS_FS_NAME_INFO *a_name_info, FATFS_DENTRY *a
     a_name_info->actual_name_length_utf8_bytes = strlen(a_name_info->fs_name->name);
 
     tag_length = strlen(tag);
-    if ((size_t)a_name_info->actual_name_length_utf8_bytes + tag_length <
+    if (a_name_info->actual_name_length_utf8_bytes + tag_length <
         FATFS_MAXNAMLEN_UTF8) {
         strcat(a_name_info->fs_name->name, tag);
     }
diff --git a/tsk/fs/ext2fs.c b/tsk/fs/ext2fs.c
index 2e800f769b13af9912fec2acff0d59dc5ce33723..ca13753e07e0ee7e7f07a9506179091009f3903a 100644
--- a/tsk/fs/ext2fs.c
+++ b/tsk/fs/ext2fs.c
@@ -115,7 +115,7 @@ static uint8_t
     /*
     * Sanity check
     */
-    if (grp_num < 0 || grp_num >= ext2fs->groups_count) {
+    if (grp_num >= ext2fs->groups_count) {
         tsk_error_reset();
         tsk_error_set_errno(TSK_ERR_FS_ARG);
         tsk_error_set_errstr
@@ -239,39 +239,11 @@ static uint8_t
  * @gdp:           pointer to group descriptor to calculate checksum for
  * returns the checksum value
  */
-
-//Temporarily removing CRC16 code until non-GPL version implemented
-//static uint16_t
-//ext4_group_desc_csum(ext2fs_sb *ext4_sb, uint32_t block_group,
-//                          struct ext4fs_gd *gdp)
-//{
-//      uint16_t crc = 0;
-//      if (*ext4_sb->s_feature_ro_compat & EXT2FS_FEATURE_RO_COMPAT_GDT_CSUM)
-//      {
-//              int offset = offsetof(struct ext4fs_gd, bg_checksum);
-//              uint32_t le_group = tsk_getu32(TSK_LIT_ENDIAN, &block_group);
-//              crc = crc16(~0, ext4_sb->s_uuid, sizeof(ext4_sb->s_uuid));
-//              crc = crc16(crc, (uint8_t *)&le_group, sizeof(le_group));
-//              crc = crc16(crc, (uint8_t *)gdp, offset);
-//              offset += sizeof(gdp->bg_checksum); /* skip checksum */
-//              /* for checksum of struct ext4_group_desc do the rest...*/
-//              if ((*ext4_sb->s_feature_incompat &
-//                   EXT2FS_FEATURE_INCOMPAT_64BIT) &&
-//                  offset < *ext4_sb->s_desc_size)
-//        {
-//                      crc = crc16(crc, (uint8_t *)gdp + offset, *ext4_sb->s_desc_size - offset);
-//        }
-//      }
-//
-//      return crc;
-//}
-
-static cm_t CRC16_CTX;
-
 static uint16_t
 ext4_group_desc_csum(ext2fs_sb * ext4_sb, uint32_t block_group,
     struct ext4fs_gd *gdp)
 {
+    cm_t CRC16_CTX;
     CRC16_CTX.cm_width = 16;
     CRC16_CTX.cm_poly = 0x8005L;
     CRC16_CTX.cm_init = 0xFFFFL;
@@ -702,8 +674,8 @@ ext2fs_dinode_copy(EXT2FS_INFO * ext2fs, TSK_FS_META * fs_meta,
             tsk_getu32(fs->endian, dino_buf->i_crtime_extra) >> 2;
     }
     else {
-        fs_meta->mtime_nano = fs_meta->atime_nano = fs_meta->ctime_nano =
-            fs_meta->crtime = 0;
+        fs_meta->mtime_nano = fs_meta->atime_nano = fs_meta->ctime_nano = 0;
+        fs_meta->crtime = 0;
     }
     fs_meta->time2.ext2.dtime_nano = 0;
     fs_meta->seq = 0;
@@ -1914,7 +1886,7 @@ ext2fs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
     else
         tsk_fprintf(hFile, "Unmounted Improperly\n");
 
-    if (sb->s_last_mounted != '\0')
+    if (sb->s_last_mounted[0] != '\0')
         tsk_fprintf(hFile, "Last mounted on: %s\n", sb->s_last_mounted);
 
     tsk_fprintf(hFile, "\nSource OS: ");
diff --git a/tsk/fs/fatxxfs.c b/tsk/fs/fatxxfs.c
index 3b8794b88e40115e7120b8ad193f860eb309bb43..154e87c209d4daca83876ae355c948b26e1300e2 100755
--- a/tsk/fs/fatxxfs.c
+++ b/tsk/fs/fatxxfs.c
@@ -58,7 +58,6 @@ static uint8_t
 fatxxfs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
 {
     unsigned int i;
-    int a;
     TSK_DADDR_T next, snext, sstart, send;
     FATFS_INFO *fatfs = (FATFS_INFO *) fs;
     FATXXFS_SB *sb = (FATXXFS_SB*)fatfs->boot_sector_buffer;
@@ -136,7 +135,7 @@ fatxxfs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
             sb->a.f16.vol_lab[8], sb->a.f16.vol_lab[9],
             sb->a.f16.vol_lab[10]);
 
-        if ((vol_label_dentry) && (vol_label_dentry->name)) {
+        if ((vol_label_dentry) && (vol_label_dentry->name[0])) {
             tsk_fprintf(hFile,
                 "Volume Label (Root Directory): %c%c%c%c%c%c%c%c%c%c%c\n",
                 vol_label_dentry->name[0], vol_label_dentry->name[1], vol_label_dentry->name[2], vol_label_dentry->name[3],
@@ -176,7 +175,7 @@ fatxxfs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
             sb->a.f32.vol_lab[8], sb->a.f32.vol_lab[9],
             sb->a.f32.vol_lab[10]);
 
-        if ((vol_label_dentry) && (vol_label_dentry->name)) {
+        if ((vol_label_dentry) && (vol_label_dentry->name[0])) {
             tsk_fprintf(hFile,
                 "Volume Label (Root Directory): %c%c%c%c%c%c%c%c%c%c%c\n",
                 vol_label_dentry->name[0], vol_label_dentry->name[1], vol_label_dentry->name[2], vol_label_dentry->name[3],
@@ -358,6 +357,7 @@ fatxxfs_fsstat(TSK_FS_INFO * fs, FILE * hFile)
     for (i = 2; i <= fatfs->lastclust; i++) {
         TSK_DADDR_T entry;
         TSK_DADDR_T sect;
+        unsigned int a;
 
         /* Get the FAT table entry */
         if (fatfs_getFAT(fatfs, i, &entry))