1 files changed, 39 insertions, 5 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a11fcc9e9f50..f643a0520872 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2012,6 +2012,13 @@ static int can_nocow_file_extent(struct btrfs_path *path,
 	 */
 
 	csum_root = btrfs_csum_root(root->fs_info, io_start);
+	if (unlikely(!csum_root)) {
+		btrfs_err(root->fs_info,
+			  "missing csum root for extent at bytenr %llu", io_start);
+		ret = -EUCLEAN;
+		goto out;
+	}
+
 	ret = btrfs_lookup_csums_list(csum_root, io_start,
 				      io_start + args->file_extent.num_bytes - 1,
 				      NULL, nowait);
@@ -2749,10 +2756,17 @@ static int add_pending_csums(struct btrfs_trans_handle *trans,
 	int ret;
 
 	list_for_each_entry(sum, list, list) {
-		trans->adding_csums = true;
-		if (!csum_root)
+		if (!csum_root) {
 			csum_root = btrfs_csum_root(trans->fs_info,
 						    sum->logical);
+			if (unlikely(!csum_root)) {
+				btrfs_err(trans->fs_info,
+				  "missing csum root for extent at bytenr %llu",
+					  sum->logical);
+				return -EUCLEAN;
+			}
+		}
+		trans->adding_csums = true;
 		ret = btrfs_csum_file_blocks(trans, csum_root, sum);
 		trans->adding_csums = false;
 		if (ret)
@@ -6612,6 +6626,25 @@ int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
 	int ret;
 	bool xa_reserved = false;
 
+	if (!args->orphan && !args->subvol) {
+		/*
+		 * Before anything else, check if we can add the name to the
+		 * parent directory. We want to avoid a dir item overflow in
+		 * case we have an existing dir item due to existing name
+		 * hash collisions. We do this check here before we call
+		 * btrfs_add_link() down below so that we can avoid a
+		 * transaction abort (which could be exploited by malicious
+		 * users).
+		 *
+		 * For subvolumes we already do this in btrfs_mksubvol().
+		 */
+		ret = btrfs_check_dir_item_collision(BTRFS_I(dir)->root,
+						     btrfs_ino(BTRFS_I(dir)),
+						     name);
+		if (ret < 0)
+			return ret;
+	}
+
 	path = btrfs_alloc_path();
 	if (!path)
 		return -ENOMEM;
@@ -9855,6 +9888,7 @@ ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
 	int compression;
 	size_t orig_count;
 	const u32 min_folio_size = btrfs_min_folio_size(fs_info);
+	const u32 blocksize = fs_info->sectorsize;
 	u64 start, end;
 	u64 num_bytes, ram_bytes, disk_num_bytes;
 	struct btrfs_key ins;
@@ -9965,9 +9999,9 @@ ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
 			ret = -EFAULT;
 			goto out_cb;
 		}
-		if (bytes < min_folio_size)
-			folio_zero_range(folio, bytes, min_folio_size - bytes);
-		ret = bio_add_folio(&cb->bbio.bio, folio, folio_size(folio), 0);
+		if (!IS_ALIGNED(bytes, blocksize))
+			folio_zero_range(folio, bytes, round_up(bytes, blocksize) - bytes);
+		ret = bio_add_folio(&cb->bbio.bio, folio, round_up(bytes, blocksize), 0);
 		if (unlikely(!ret)) {
 			folio_put(folio);
 			ret = -EINVAL;