From: Gao Xiang <hsiangkao@linux.alibaba.com>
Date: Wed, 22 Sep 2021 09:51:41 +0000 (+0800)
Subject: erofs: fix misbehavior of unsupported chunk format check
X-Git-Tag: v5.15~185^2~1
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=d705117ddd724a9d4877e338e4587010ab6a1c62;p=mirror_ubuntu-kernels.git

erofs: fix misbehavior of unsupported chunk format check

Unsupported chunk format should be checked with
"if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL)"

Found when checking with 4k-byte blockmap (although currently mkfs
uses inode chunk indexes format by default.)

Link: https://lore.kernel.org/r/20210922095141.233938-1-hsiangkao@linux.alibaba.com
Fixes: c5aa903a59db ("erofs: support reading chunk-based uncompressed files")
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
---

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index 31ac3a73b390..a552399e211d 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -176,7 +176,7 @@ static struct page *erofs_read_inode(struct inode *inode,
 	}
 
 	if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
-		if (!(vi->chunkformat & EROFS_CHUNK_FORMAT_ALL)) {
+		if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
 			erofs_err(inode->i_sb,
 				  "unsupported chunk format %x of nid %llu",
 				  vi->chunkformat, vi->nid);