exfat: add error check when updating dir-entries

Add error check when synchronously updating dir-entries.
Suggested-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>

fs/exfat/dir.c

@@ -604,7 +604,7 @@ void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es)
 	es->modified = true;
 }
 
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 {
 	int i, err = 0;
 
@@ -617,6 +617,7 @@ void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
 		else
 			brelse(es->bh[i]);
 	kfree(es);
+	return err;
 }
 
 static int exfat_walk_fat_chain(struct super_block *sb,

fs/exfat/exfat_fs.h

@@ -460,7 +460,7 @@ struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
 		int num);
 struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
 		struct exfat_chain *p_dir, int entry, unsigned int type);
-void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
+int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
 
 /* inode.c */

fs/exfat/file.c

@@ -154,6 +154,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		struct timespec64 ts;
 		struct exfat_dentry *ep, *ep2;
 		struct exfat_entry_set_cache *es;
+		int err;
 
 		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -188,7 +189,9 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 		}
 
 		exfat_update_dir_chksum_with_entry_set(es);
-		exfat_free_dentry_set(es, inode_needs_sync(inode));
+		err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+		if (err)
+			return err;
 	}
 
 	/* cut off from the FAT chain */

fs/exfat/inode.c

@@ -77,8 +77,7 @@ static int __exfat_write_inode(struct inode *inode, int sync)
 	ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
 
 	exfat_update_dir_chksum_with_entry_set(es);
-	exfat_free_dentry_set(es, sync);
-	return 0;
+	return exfat_free_dentry_set(es, sync);
 }
 
 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
@@ -222,6 +221,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 		if (ei->dir.dir != DIR_DELETED && modified) {
 			struct exfat_dentry *ep;
 			struct exfat_entry_set_cache *es;
+			int err;
 
 			es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 				ES_ALL_ENTRIES);
@@ -240,8 +240,9 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 				ep->dentry.stream.valid_size;
 
 			exfat_update_dir_chksum_with_entry_set(es);
-			exfat_free_dentry_set(es, inode_needs_sync(inode));
-
+			err = exfat_free_dentry_set(es, inode_needs_sync(inode));
+			if (err)
+				return err;
 		} /* end of if != DIR_DELETED */
 
 		inode->i_blocks +=