Patch "staging: erofs: some compressed cluster should be submitted for corrupted images" has been added to the 4.19-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    staging: erofs: some compressed cluster should be submitted for corrupted images

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     staging-erofs-some-compressed-cluster-should-be-submitted-for-corrupted-images.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From foo at baz Wed 09 Oct 2019 03:26:06 PM CEST
From: Gao Xiang <gaoxiang25 at huawei.com>
Date: Wed, 9 Oct 2019 18:12:37 +0800
Subject: staging: erofs: some compressed cluster should be submitted for corrupted images
To: Greg Kroah-Hartman <gregkh at linuxfoundation.org>, <stable at vger.kernel.org>, Chao Yu <yuchao0 at huawei.com>
Cc: <linux-erofs at lists.ozlabs.org>, Miao Xie <miaoxie at huawei.com>, Gao Xiang <gaoxiang25 at huawei.com>
Message-ID: <20191009101239.195587-2-gaoxiang25 at huawei.com>

From: Gao Xiang <gaoxiang25 at huawei.com>

commit ee45197c807895e156b2be0abcaebdfc116487c8 upstream.

As reported by erofs_utils fuzzer, a logical page can belong
to at most 2 compressed clusters, if one compressed cluster
is corrupted, but the other has been ready in submitting chain.

The chain needs to submit anyway in order to keep the page
working properly (page unlocked with PG_error set, PG_uptodate
not set).

Let's fix it now.

Fixes: 3883a79abd02 ("staging: erofs: introduce VLE decompression support")
Cc: <stable at vger.kernel.org> # 4.19+
Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
Reviewed-by: Chao Yu <yuchao0 at huawei.com>
Link: https://lore.kernel.org/r/20190819103426.87579-2-gaoxiang25@huawei.com
[ Gao Xiang: Manually backport to v4.19.y stable. ]
Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/erofs/unzip_vle.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1335,19 +1335,18 @@ static int z_erofs_vle_normalaccess_read
 	err = z_erofs_do_read_page(&f, page, &pagepool);
 	(void)z_erofs_vle_work_iter_end(&f.builder);
 
-	if (err) {
+	/* if some compressed cluster ready, need submit them anyway */
+	z_erofs_submit_and_unzip(&f, &pagepool, true);
+
+	if (err)
 		errln("%s, failed to read, err [%d]", __func__, err);
-		goto out;
-	}
 
-	z_erofs_submit_and_unzip(&f, &pagepool, true);
-out:
 	if (f.m_iter.mpage != NULL)
 		put_page(f.m_iter.mpage);
 
 	/* clean up the remaining free pages */
 	put_pages_list(&pagepool);
-	return 0;
+	return err;
 }
 
 static inline int __z_erofs_vle_normalaccess_readpages(


Patches currently in stable-queue which might be from gaoxiang25 at huawei.com are

queue-4.19/staging-erofs-fix-an-error-handling-in-erofs_readdir.patch
queue-4.19/staging-erofs-detect-potential-multiref-due-to-corrupted-images.patch
queue-4.19/staging-erofs-some-compressed-cluster-should-be-submitted-for-corrupted-images.patch
queue-4.19/staging-erofs-add-two-missing-erofs_workgroup_put-for-corrupted-images.patch