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Message-Id: <20191010083614.097681169@linuxfoundation.org>
Date: Thu, 10 Oct 2019 10:36:57 +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 4.19 110/114] staging: erofs: add two missing erofs_workgroup_put for corrupted images
From: Gao Xiang <gaoxiang25@...wei.com>
commit 138e1a0990e80db486ab9f6c06bd5c01f9a97999 upstream.
As reported by erofs-utils fuzzer, these error handling
path will be entered to handle corrupted images.
Lack of erofs_workgroup_puts will cause unmounting
unsuccessfully.
Fix these return values to EFSCORRUPTED as well.
Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support")
Cc: <stable@...r.kernel.org> # 4.19+
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Link: https://lore.kernel.org/r/20190819103426.87579-4-gaoxiang25@huawei.com
[ Gao Xiang: Older kernel versions don't have length validity check
and EFSCORRUPTED, thus backport pageofs check for now. ]
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/staging/erofs/unzip_vle.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -311,7 +311,11 @@ z_erofs_vle_work_lookup(struct super_blo
/* if multiref is disabled, `primary' is always true */
primary = true;
- DBG_BUGON(work->pageofs != pageofs);
+ if (work->pageofs != pageofs) {
+ DBG_BUGON(1);
+ erofs_workgroup_put(egrp);
+ return ERR_PTR(-EIO);
+ }
/*
* lock must be taken first to avoid grp->next == NIL between
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