linux-kernel - [PATCH 5.3 279/344] staging: erofs: cannot set EROFS_V_Z_INITED_BIT if fill_inode

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Date:   Thu,  3 Oct 2019 17:54:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 5.3 279/344] staging: erofs: cannot set EROFS_V_Z_INITED_BIT if fill_inode_lazy fails

From: Gao Xiang <gaoxiang25@...wei.com>

commit 3407a4198faf01c9d7596c45b8606834b8dfc2b7 upstream.

As reported by erofs-utils fuzzer, unsupported compressed
clustersize will make fill_inode_lazy fail, for such case
we cannot set EROFS_V_Z_INITED_BIT since we need return
failure for each z_erofs_map_blocks_iter().

Fixes: 152a333a5895 ("staging: erofs: add compacted compression indexes support")
Cc: <stable@...r.kernel.org> # 5.3+
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Link: https://lore.kernel.org/r/20190819103426.87579-3-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/erofs/zmap.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/staging/erofs/zmap.c
+++ b/drivers/staging/erofs/zmap.c
@@ -86,12 +86,11 @@ static int fill_inode_lazy(struct inode
 
 	vi->z_physical_clusterbits[1] = vi->z_logical_clusterbits +
 					((h->h_clusterbits >> 5) & 7);
+	set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
 unmap_done:
 	kunmap_atomic(kaddr);
 	unlock_page(page);
 	put_page(page);
-
-	set_bit(EROFS_V_Z_INITED_BIT, &vi->flags);
 out_unlock:
 	clear_and_wake_up_bit(EROFS_V_BL_Z_BIT, &vi->flags);
 	return err;