This pull request contains the following changes for UBI, UBIFS and JFFS2:

UBI:
 - Be less stupid when placing a fastmap anchor
 - Try harder to get an empty PEB in case of contention
 - Make ubiblock to warn if image is not a multiple of 512
 
 UBIFS:
 - Various fixes in error paths
 
 JFFS2:
 - Various fixes in error paths
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Merge tag 'upstream-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs

Pull UBI, UBIFS and JFFS2 updates from Richard Weinberger:
 "UBI:
   - Be less stupid when placing a fastmap anchor
   - Try harder to get an empty PEB in case of contention
   - Make ubiblock to warn if image is not a multiple of 512

  UBIFS:
   - Various fixes in error paths

  JFFS2:
   - Various fixes in error paths"

* tag 'upstream-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs:
  jffs2: Fix memory leak in jffs2_scan_eraseblock() error path
  jffs2: Remove jffs2_gc_fetch_page and jffs2_gc_release_page
  jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to_fragtree()
  ubi: block: Warn if volume size is not multiple of 512
  ubifs: Fix memory leak bug in alloc_ubifs_info() error path
  ubifs: Fix memory leak in __ubifs_node_verify_hmac error path
  ubifs: Fix memory leak in read_znode() error path
  ubi: ubi_wl_get_peb: Increase the number of attempts while getting PEB
  ubi: Don't do anchor move within fastmap area
  ubifs: Remove redundant assignment to pointer fname

drivers/mtd/ubi/block.c

@@ -345,15 +345,36 @@ static const struct blk_mq_ops ubiblock_mq_ops = {
 	.init_request	= ubiblock_init_request,
 };
 
+static int calc_disk_capacity(struct ubi_volume_info *vi, u64 *disk_capacity)
+{
+	u64 size = vi->used_bytes >> 9;
+
+	if (vi->used_bytes % 512) {
+		pr_warn("UBI: block: volume size is not a multiple of 512, "
+			"last %llu bytes are ignored!\n",
+			vi->used_bytes - (size << 9));
+	}
+
+	if ((sector_t)size != size)
+		return -EFBIG;
+
+	*disk_capacity = size;
+
+	return 0;
+}
+
 int ubiblock_create(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
 	struct gendisk *gd;
-	u64 disk_capacity = vi->used_bytes >> 9;
+	u64 disk_capacity;
 	int ret;
 
-	if ((sector_t)disk_capacity != disk_capacity)
-		return -EFBIG;
+	ret = calc_disk_capacity(vi, &disk_capacity);
+	if (ret) {
+		return ret;
+	}
+
 	/* Check that the volume isn't already handled */
 	mutex_lock(&devices_mutex);
 	if (find_dev_nolock(vi->ubi_num, vi->vol_id)) {
@@ -507,7 +528,8 @@ int ubiblock_remove(struct ubi_volume_info *vi)
 static int ubiblock_resize(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
-	u64 disk_capacity = vi->used_bytes >> 9;
+	u64 disk_capacity;
+	int ret;
 
 	/*
 	 * Need to lock the device list until we stop using the device,
@@ -520,11 +542,16 @@ static int ubiblock_resize(struct ubi_volume_info *vi)
 		mutex_unlock(&devices_mutex);
 		return -ENODEV;
 	}
-	if ((sector_t)disk_capacity != disk_capacity) {
+
+	ret = calc_disk_capacity(vi, &disk_capacity);
+	if (ret) {
 		mutex_unlock(&devices_mutex);
-		dev_warn(disk_to_dev(dev->gd), "the volume is too big (%d LEBs), cannot resize",
-			 vi->size);
-		return -EFBIG;
+		if (ret == -EFBIG) {
+			dev_warn(disk_to_dev(dev->gd),
+				 "the volume is too big (%d LEBs), cannot resize",
+				 vi->size);
+		}
+		return ret;
 	}
 
 	mutex_lock(&dev->dev_mutex);

drivers/mtd/ubi/fastmap-wl.c

@@ -196,7 +196,7 @@ static int produce_free_peb(struct ubi_device *ubi)
  */
 int ubi_wl_get_peb(struct ubi_device *ubi)
 {
-	int ret, retried = 0;
+	int ret, attempts = 0;
 	struct ubi_fm_pool *pool = &ubi->fm_pool;
 	struct ubi_fm_pool *wl_pool = &ubi->fm_wl_pool;
 
@@ -221,12 +221,12 @@ int ubi_wl_get_peb(struct ubi_device *ubi)
 
 	if (pool->used == pool->size) {
 		spin_unlock(&ubi->wl_lock);
-		if (retried) {
+		attempts++;
+		if (attempts == 10) {
 			ubi_err(ubi, "Unable to get a free PEB from user WL pool");
 			ret = -ENOSPC;
 			goto out;
 		}
-		retried = 1;
 		up_read(&ubi->fm_eba_sem);
 		ret = produce_free_peb(ubi);
 		if (ret < 0) {

drivers/mtd/ubi/wl.c

@@ -710,6 +710,12 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
 		if (!e2)
 			goto out_cancel;
 
+		/*
+		 * Anchor move within the anchor area is useless.
+		 */
+		if (e2->pnum < UBI_FM_MAX_START)
+			goto out_cancel;
+
 		self_check_in_wl_tree(ubi, e1, &ubi->used);
 		rb_erase(&e1->u.rb, &ubi->used);
 		dbg_wl("anchor-move PEB %d to PEB %d", e1->pnum, e2->pnum);

fs/jffs2/fs.c

@@ -682,33 +682,6 @@ struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
 	return JFFS2_INODE_INFO(inode);
 }
 
-unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
-				   struct jffs2_inode_info *f,
-				   unsigned long offset,
-				   unsigned long *priv)
-{
-	struct inode *inode = OFNI_EDONI_2SFFJ(f);
-	struct page *pg;
-
-	pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT,
-			     jffs2_do_readpage_unlock, inode);
-	if (IS_ERR(pg))
-		return (void *)pg;
-
-	*priv = (unsigned long)pg;
-	return kmap(pg);
-}
-
-void jffs2_gc_release_page(struct jffs2_sb_info *c,
-			   unsigned char *ptr,
-			   unsigned long *priv)
-{
-	struct page *pg = (void *)*priv;
-
-	kunmap(pg);
-	put_page(pg);
-}
-
 static int jffs2_flash_setup(struct jffs2_sb_info *c) {
 	int ret = 0;
 

fs/jffs2/gc.c

@@ -1165,12 +1165,13 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 				       struct jffs2_inode_info *f, struct jffs2_full_dnode *fn,
 				       uint32_t start, uint32_t end)
 {
+	struct inode *inode = OFNI_EDONI_2SFFJ(f);
 	struct jffs2_full_dnode *new_fn;
 	struct jffs2_raw_inode ri;
 	uint32_t alloclen, offset, orig_end, orig_start;
 	int ret = 0;
 	unsigned char *comprbuf = NULL, *writebuf;
-	unsigned long pg;
+	struct page *page;
 	unsigned char *pg_ptr;
 
 	memset(&ri, 0, sizeof(ri));
@@ -1325,15 +1326,18 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 	 * end up here trying to GC the *same* page that jffs2_write_begin() is
 	 * trying to write out, read_cache_page() will not deadlock. */
 	mutex_unlock(&f->sem);
-	pg_ptr = jffs2_gc_fetch_page(c, f, start, &pg);
-	mutex_lock(&f->sem);
-
-	if (IS_ERR(pg_ptr)) {
+	page = read_cache_page(inode->i_mapping, start >> PAGE_SHIFT,
+			       jffs2_do_readpage_unlock, inode);
+	if (IS_ERR(page)) {
 		pr_warn("read_cache_page() returned error: %ld\n",
-			PTR_ERR(pg_ptr));
-		return PTR_ERR(pg_ptr);
+			PTR_ERR(page));
+		mutex_lock(&f->sem);
+		return PTR_ERR(page);
 	}
 
+	pg_ptr = kmap(page);
+	mutex_lock(&f->sem);
+
 	offset = start;
 	while(offset < orig_end) {
 		uint32_t datalen;
@@ -1396,6 +1400,7 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 		}
 	}
 
-	jffs2_gc_release_page(c, pg_ptr, &pg);
+	kunmap(page);
+	put_page(page);
 	return ret;
 }

fs/jffs2/nodelist.c

@@ -226,7 +226,7 @@ static int jffs2_add_frag_to_fragtree(struct jffs2_sb_info *c, struct rb_root *r
 		lastend = this->ofs + this->size;
 	} else {
 		dbg_fragtree2("lookup gave no frag\n");
-		lastend = 0;
+		return -EINVAL;
 	}
 
 	/* See if we ran off the end of the fragtree */

fs/jffs2/os-linux.h

@@ -183,9 +183,6 @@ unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
 				   struct jffs2_inode_info *f,
 				   unsigned long offset,
 				   unsigned long *priv);
-void jffs2_gc_release_page(struct jffs2_sb_info *c,
-			   unsigned char *pg,
-			   unsigned long *priv);
 void jffs2_flash_cleanup(struct jffs2_sb_info *c);
 
 

fs/jffs2/scan.c

@@ -527,8 +527,11 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
 					err = jffs2_fill_scan_buf(c, sumptr, 
 								  jeb->offset + c->sector_size - sumlen,
 								  sumlen - buf_len);				
-					if (err)
+					if (err) {
+						if (sumlen > buf_size)
+							kfree(sumptr);
 						return err;
+					}
 				}
 			}
 

fs/ubifs/auth.c

@@ -479,8 +479,10 @@ int __ubifs_node_verify_hmac(const struct ubifs_info *c, const void *node,
 		return -ENOMEM;
 
 	err = ubifs_node_calc_hmac(c, node, len, ofs_hmac, hmac);
-	if (err)
+	if (err) {
+		kfree(hmac);
 		return err;
+	}
 
 	err = crypto_memneq(hmac, node + ofs_hmac, hmac_len);
 

fs/ubifs/debug.c

@@ -2817,7 +2817,6 @@ void dbg_debugfs_init_fs(struct ubifs_info *c)
 		     c->vi.ubi_num, c->vi.vol_id);
 	if (n == UBIFS_DFS_DIR_LEN) {
 		/* The array size is too small */
-		fname = UBIFS_DFS_DIR_NAME;
 		return;
 	}
 

fs/ubifs/super.c

@@ -2267,8 +2267,10 @@ static struct dentry *ubifs_mount(struct file_system_type *fs_type, int flags,
 		}
 	} else {
 		err = ubifs_fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
-		if (err)
+		if (err) {
+			kfree(c);
 			goto out_deact;
+		}
 		/* We do not support atime */
 		sb->s_flags |= SB_ACTIVE;
 		if (IS_ENABLED(CONFIG_UBIFS_ATIME_SUPPORT))

fs/ubifs/tnc_misc.c

@@ -284,6 +284,7 @@ static int read_znode(struct ubifs_info *c, struct ubifs_zbranch *zzbr,
 	err = ubifs_node_check_hash(c, idx, zzbr->hash);
 	if (err) {
 		ubifs_bad_hash(c, idx, zzbr->hash, lnum, offs);
+		kfree(idx);
 		return err;
 	}