[PATCH] erofs-utils: lib: fix dropped inode buffer write errors

[Vansh Choudhary <ch@vnsh.in>]

erofs_mkfs_handle_nondirectory() discards the return values of
erofs_prepare_inode_buffer() and erofs_write_tail_end() and always
returns 0, so ENOSPC, ENOMEM, and tail-write I/O errors silently
produce a corrupt image.

Return those errors to the caller. Fix the same dropped returns in
erofs_mkfs_jobfn() and erofs_mkfs_build_special_from_fd().

Signed-off-by: Vansh Choudhary <ch@vnsh.in>
---
 lib/inode.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/lib/inode.c b/lib/inode.c
index 95fd93b..b3e5f62 100644
--- a/lib/inode.c
+++ b/lib/inode.c
@@ -1574,9 +1574,10 @@ static int erofs_mkfs_handle_nondirectory(const struct erofs_mkfs_btctx *btctx,
 	}
 	if (ret)
 		return ret;
-	erofs_prepare_inode_buffer(btctx->im, inode);
-	erofs_write_tail_end(btctx->im, inode);
-	return 0;
+	ret = erofs_prepare_inode_buffer(btctx->im, inode);
+	if (ret)
+		return ret;
+	return erofs_write_tail_end(btctx->im, inode);
 }
 
 static int erofs_mkfs_create_directory(const struct erofs_mkfs_btctx *ctx,
@@ -1650,7 +1651,9 @@ static int erofs_mkfs_jobfn(const struct erofs_mkfs_btctx *ctx,
 		ret = erofs_write_dir_file(ctx->im, inode);
 		if (ret)
 			return ret;
-		erofs_write_tail_end(ctx->im, inode);
+		ret = erofs_write_tail_end(ctx->im, inode);
+		if (ret)
+			return ret;
 		inode->bh->op = &erofs_write_inode_bhops;
 		erofs_iput(inode);
 		return 0;
@@ -2406,8 +2409,12 @@ struct erofs_inode *erofs_mkfs_build_special_from_fd(struct erofs_importer *im,
 	if (ret)
 		return ERR_PTR(ret);
 out:
-	erofs_prepare_inode_buffer(im, inode);
-	erofs_write_tail_end(im, inode);
+	ret = erofs_prepare_inode_buffer(im, inode);
+	if (ret)
+		return ERR_PTR(ret);
+	ret = erofs_write_tail_end(im, inode);
+	if (ret)
+		return ERR_PTR(ret);
 	return inode;
 }
 
-- 
2.43.0