fix kernel null dereference when accessing a fat16/fat32 disk

zhang359264726 · Aug 12, 2013 · 3c125fd · 3c125fd
1 parent 6d3631a
commit 3c125fd
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/exfat_nls.c b/exfat_nls.c
@@ -66,7 +66,7 @@ UINT16 nls_upper(struct super_block *sb, UINT16 a)
 
 	if (EXFAT_SB(sb)->options.casesensitive)
 		return(a);
-	if ((p_fs->vol_utbl)[get_col_index(a)] != NULL)
+	if (p_fs->vol_utbl != NULL && (p_fs->vol_utbl)[get_col_index(a)] != NULL)
 		return (p_fs->vol_utbl)[get_col_index(a)][get_row_index(a)];
 	else
 		return a;