linux-kernel - [PATCH 5.4 42/46] Revert "jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to

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Message-Id: <20191203212805.427358245@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:36:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hou Tao <houtao1@...wei.com>,
        Joel Stanley <joel@....id.au>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 5.4 42/46] Revert "jffs2: Fix possible null-pointer dereferences in jffs2_add_frag_to_fragtree()"

From: Joel Stanley <joel@....id.au>

commit 6e78c01fde9023e0701f3af880c1fd9de6e4e8e3 upstream.

This reverts commit f2538f999345405f7d2e1194c0c8efa4e11f7b3a. The patch
stopped JFFS2 from being able to mount an existing filesystem with the
following errors:

 jffs2: error: (77) jffs2_build_inode_fragtree: Add node to tree failed -22
 jffs2: error: (77) jffs2_do_read_inode_internal: Failed to build final fragtree for inode #5377: error -22

Fixes: f2538f999345 ("jffs2: Fix possible null-pointer dereferences...")
Cc: stable@...r.kernel.org
Suggested-by: Hou Tao <houtao1@...wei.com>
Signed-off-by: Joel Stanley <joel@....id.au>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/jffs2/nodelist.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/jffs2/nodelist.c
+++ b/fs/jffs2/nodelist.c
@@ -226,7 +226,7 @@ static int jffs2_add_frag_to_fragtree(st
 		lastend = this->ofs + this->size;
 	} else {
 		dbg_fragtree2("lookup gave no frag\n");
-		return -EINVAL;
+		lastend = 0;
 	}
 
 	/* See if we ran off the end of the fragtree */